/////////////////////////////////////////////////////////////////////////////
-// Name: thread.cpp
+// Name: src/mac/carbon/thread.cpp
// Purpose: wxThread Implementation
// Author: Original from Wolfram Gloger/Guilhem Lavaux/Vadim Zeitlin
-// Modified by: Stefan Csomor
+// Modified by: Aj Lavin, Stefan Csomor
// Created: 04/22/98
// RCS-ID: $Id$
// Copyright: (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998),
-// Vadim Zeitlin (1999) , Stefan Csomor (2000)
+// Vadim Zeitlin (1999), Stefan Csomor (2000)
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifdef __GNUG__
- #pragma implementation "thread.h"
-#endif
-
-// ----------------------------------------------------------------------------
-// headers
-// ----------------------------------------------------------------------------
-
-// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#if defined(__BORLANDC__)
#ifndef WX_PRECOMP
#include "wx/wx.h"
+ #include "wx/module.h"
#endif
#if wxUSE_THREADS
-#include "wx/module.h"
#include "wx/thread.h"
-#ifdef __WXMAC__
-#include <Threads.h>
+#include <CoreServices/CoreServices.h>
#include "wx/mac/uma.h"
-#endif
-
-#define INFINITE 0xFFFFFFFF
-
-// ----------------------------------------------------------------------------
-// constants
-// ----------------------------------------------------------------------------
-// the possible states of the thread ("=>" shows all possible transitions from
-// this state)
+// the possible states of the thread:
+// ("=>" shows all possible transitions from this state)
enum wxThreadState
{
- STATE_NEW, // didn't start execution yet (=> RUNNING)
- STATE_RUNNING, // thread is running (=> PAUSED, CANCELED)
- STATE_PAUSED, // thread is temporarily suspended (=> RUNNING)
- STATE_CANCELED, // thread should terminate a.s.a.p. (=> EXITED)
- STATE_EXITED // thread is terminating
+ STATE_NEW, // didn't start execution yet (=> RUNNING)
+ STATE_RUNNING, // thread is running (=> PAUSED, CANCELED)
+ STATE_PAUSED, // thread is temporarily suspended (=> RUNNING)
+ STATE_CANCELED, // thread should terminate a.s.a.p. (=> EXITED)
+ STATE_EXITED // thread is terminating
};
// ----------------------------------------------------------------------------
-// this module globals
+// globals
// ----------------------------------------------------------------------------
-static ThreadID gs_idMainThread = kNoThreadID ;
-static bool gs_waitingForThread = FALSE ;
+// the task ID of the main thread
+static wxThreadIdType gs_idMainThread = kInvalidID;
+
+// this is the Per-Task Storage for the pointer to the appropriate wxThread
+TaskStorageIndex gs_tlsForWXThread = 0;
+
+// if it's false, some secondary thread is holding the GUI lock
+static bool gs_bGuiOwnedByMainThread = true;
+
+// critical section which controls access to all GUI functions: any secondary
+// thread (i.e. except the main one) must enter this crit section before doing
+// any GUI calls
+static wxCriticalSection *gs_critsectGui = NULL;
+
+// critical section which protects gs_nWaitingForGui variable
+static wxCriticalSection *gs_critsectWaitingForGui = NULL;
+
+// number of threads waiting for GUI in wxMutexGuiEnter()
+static size_t gs_nWaitingForGui = 0;
+
+// overall number of threads, needed for determining
+// the sleep value of the main event loop
+size_t g_numberOfThreads = 0;
+
+
+#if wxUSE_GUI
+MPCriticalRegionID gs_guiCritical = kInvalidID;
+#endif
// ============================================================================
// MacOS implementation of thread classes
// ============================================================================
-class wxMacStCritical
+/*
+ Notes :
+
+ The implementation is very close to the phtreads implementation, the reason for
+ using MPServices is the fact that these are also available under OS 9. Thus allowing
+ for one common API for all current builds.
+
+ As soon as wxThreads are on a 64 bit address space, the TLS must be extended
+ to use two indices one for each 32 bit part as the MP implementation is limited
+ to longs.
+
+ I have three implementations for mutexes :
+ version A based on a binary semaphore, problem - not reentrant, version B based
+ on a critical region, allows for reentrancy, performance implications not
+ yet tested, and third a plain pthreads implementation
+
+ The same for condition internal, one implementation by Aj Lavin and the other one
+ copied from the thrimpl.cpp which I assume has been more broadly tested, I've just
+ replaced the interlock increment with the appropriate PPC calls
+*/
+
+// ----------------------------------------------------------------------------
+// wxCriticalSection
+// ----------------------------------------------------------------------------
+
+wxCriticalSection::wxCriticalSection()
{
-public :
- wxMacStCritical()
- {
- if ( UMASystemIsInitialized() )
- ThreadBeginCritical() ;
- }
- ~wxMacStCritical()
- {
- if ( UMASystemIsInitialized() )
- ThreadEndCritical() ;
- }
-};
+ MPCreateCriticalRegion( (MPCriticalRegionID*) &m_critRegion );
+}
+
+wxCriticalSection::~wxCriticalSection()
+{
+ MPDeleteCriticalRegion( (MPCriticalRegionID) m_critRegion );
+}
+
+void wxCriticalSection::Enter()
+{
+ MPEnterCriticalRegion( (MPCriticalRegionID) m_critRegion, kDurationForever );
+}
+
+void wxCriticalSection::Leave()
+{
+ MPExitCriticalRegion( (MPCriticalRegionID) m_critRegion );
+}
// ----------------------------------------------------------------------------
// wxMutex implementation
// ----------------------------------------------------------------------------
+#define wxUSE_MAC_SEMAPHORE_MUTEX 0
+#define wxUSE_MAC_CRITICAL_REGION_MUTEX 1
+#define wxUSE_MAC_PTHREADS_MUTEX 0
+
+#if wxUSE_MAC_PTHREADS_MUTEX
+
+#include <pthread.h>
+
+
class wxMutexInternal
{
public:
- wxMutexInternal(wxMutexType WXUNUSED(mutexType))
+ wxMutexInternal( wxMutexType mutexType );
+ ~wxMutexInternal();
+
+ wxMutexError Lock();
+ wxMutexError TryLock();
+ wxMutexError Unlock();
+
+ bool IsOk() const
+ { return m_isOk; }
+
+private:
+ pthread_mutex_t m_mutex;
+ bool m_isOk;
+
+ // wxConditionInternal uses our m_mutex
+ friend class wxConditionInternal;
+};
+
+#ifdef HAVE_PTHREAD_MUTEXATTR_T
+// on some systems pthread_mutexattr_settype() is not in the headers (but it is
+// in the library, otherwise we wouldn't compile this code at all)
+extern "C" int pthread_mutexattr_settype( pthread_mutexattr_t *, int );
+#endif
+
+wxMutexInternal::wxMutexInternal( wxMutexType mutexType )
+{
+ int err;
+ switch ( mutexType )
{
- m_owner = kNoThreadID ;
- m_locked = 0;
+ case wxMUTEX_RECURSIVE:
+ // support recursive locks like Win32, i.e. a thread can lock a
+ // mutex which it had itself already locked
+ //
+ // unfortunately initialization of recursive mutexes is non
+ // portable, so try several methods
+#ifdef HAVE_PTHREAD_MUTEXATTR_T
+ {
+ pthread_mutexattr_t attr;
+ pthread_mutexattr_init( &attr );
+ pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
+
+ err = pthread_mutex_init( &m_mutex, &attr );
+ }
+#elif defined(HAVE_PTHREAD_RECURSIVE_MUTEX_INITIALIZER)
+ // we can use this only as initializer so we have to assign it
+ // first to a temp var - assigning directly to m_mutex wouldn't
+ // even compile
+ {
+ pthread_mutex_t mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+ m_mutex = mutex;
+ }
+#else // no recursive mutexes
+ err = EINVAL;
+#endif // HAVE_PTHREAD_MUTEXATTR_T/...
+ break;
+
+ default:
+ wxFAIL_MSG( wxT("unknown mutex type") );
+ // fall through
+
+ case wxMUTEX_DEFAULT:
+ err = pthread_mutex_init( &m_mutex, NULL );
+ break;
}
- ~wxMutexInternal()
+ m_isOk = err == 0;
+ if ( !m_isOk )
{
- if ( m_locked > 0 )
+ wxLogApiError( wxT("pthread_mutex_init()"), err );
+ }
+}
+
+wxMutexInternal::~wxMutexInternal()
+{
+ if ( m_isOk )
+ {
+ int err = pthread_mutex_destroy( &m_mutex );
+ if ( err != 0 )
{
- wxLogDebug(_T("Warning: freeing a locked mutex (%d locks)."), m_locked);
+ wxLogApiError( wxT("pthread_mutex_destroy()"), err );
}
}
+}
- bool IsOk() const { return true; }
+wxMutexError wxMutexInternal::Lock()
+{
+ int err = pthread_mutex_lock( &m_mutex );
+ switch ( err )
+ {
+ case EDEADLK:
+ // only error checking mutexes return this value and so it's an
+ // unexpected situation -- hence use assert, not wxLogDebug
+ wxFAIL_MSG( wxT("mutex deadlock prevented") );
+ return wxMUTEX_DEAD_LOCK;
- wxMutexError Lock() ;
- wxMutexError TryLock() ;
- wxMutexError Unlock();
+ case EINVAL:
+ wxLogDebug( wxT("pthread_mutex_lock(): mutex not initialized.") );
+ break;
+
+ case 0:
+ return wxMUTEX_NO_ERROR;
+
+ default:
+ wxLogApiError( wxT("pthread_mutex_lock()"), err );
+ }
+
+ return wxMUTEX_MISC_ERROR;
+}
+
+wxMutexError wxMutexInternal::TryLock()
+{
+ int err = pthread_mutex_trylock( &m_mutex );
+ switch ( err )
+ {
+ case EBUSY:
+ // not an error: mutex is already locked, but we're prepared for this case
+ return wxMUTEX_BUSY;
+
+ case EINVAL:
+ wxLogDebug( wxT("pthread_mutex_trylock(): mutex not initialized.") );
+ break;
+
+ case 0:
+ return wxMUTEX_NO_ERROR;
+
+ default:
+ wxLogApiError( wxT("pthread_mutex_trylock()"), err );
+ }
+
+ return wxMUTEX_MISC_ERROR;
+}
+
+wxMutexError wxMutexInternal::Unlock()
+{
+ int err = pthread_mutex_unlock( &m_mutex );
+ switch ( err )
+ {
+ case EPERM:
+ // we don't own the mutex
+ return wxMUTEX_UNLOCKED;
+
+ case EINVAL:
+ wxLogDebug( wxT("pthread_mutex_unlock(): mutex not initialized.") );
+ break;
+
+ case 0:
+ return wxMUTEX_NO_ERROR;
+
+ default:
+ wxLogApiError( wxT("pthread_mutex_unlock()"), err );
+ }
+
+ return wxMUTEX_MISC_ERROR;
+}
+
+#endif
+
+#if wxUSE_MAC_SEMAPHORE_MUTEX
+
+class wxMutexInternal
+{
public:
- ThreadID m_owner ;
- wxArrayLong m_waiters ;
- long m_locked ;
+ wxMutexInternal( wxMutexType mutexType );
+ virtual ~wxMutexInternal();
+
+ bool IsOk() const
+ { return m_isOk; }
+
+ wxMutexError Lock();
+ wxMutexError TryLock();
+ wxMutexError Unlock();
+
+private:
+ MPSemaphoreID m_semaphore;
+ bool m_isOk;
};
+wxMutexInternal::wxMutexInternal(wxMutexType mutexType )
+{
+ m_isOk = false;
+ m_semaphore = kInvalidID;
+ OSStatus err = noErr;
+
+ switch ( mutexType )
+ {
+ case wxMUTEX_DEFAULT :
+ verify_noerr( MPCreateBinarySemaphore( &m_semaphore ) );
+ m_isOk = ( m_semaphore != kInvalidID );
+ break;
+
+ case wxMUTEX_RECURSIVE :
+ wxFAIL_MSG( wxT("Recursive Mutex not supported yet") );
+ break;
+
+ default :
+ wxFAIL_MSG( wxT("Unknown mutex type") );
+ break;
+ }
+}
+
+wxMutexInternal::~wxMutexInternal()
+{
+ if ( m_semaphore != kInvalidID )
+ MPDeleteSemaphore( m_semaphore );
+
+ MPYield();
+}
+
wxMutexError wxMutexInternal::Lock()
{
- wxMacStCritical critical ;
- if ( UMASystemIsInitialized() )
+ wxCHECK_MSG( m_isOk, wxMUTEX_MISC_ERROR, wxT("Invalid Mutex") );
+ OSStatus err = MPWaitOnSemaphore( m_semaphore, kDurationForever );
+ if (err != noErr)
{
- OSErr err ;
- ThreadID current = kNoThreadID;
- err = ::MacGetCurrentThread(¤t);
- // if we are not the owner, add this thread to the list of waiting threads, stop this thread
- // and invoke the scheduler to continue executing the owner's thread
- while ( m_owner != kNoThreadID && m_owner != current)
- {
- m_waiters.Add(current);
- err = ::SetThreadStateEndCritical(kCurrentThreadID, kStoppedThreadState, m_owner);
- err = ::ThreadBeginCritical();
- }
- m_owner = current;
+ wxLogSysError( wxT("Could not lock mutex") );
+
+ return wxMUTEX_MISC_ERROR;
}
- m_locked++;
return wxMUTEX_NO_ERROR;
}
wxMutexError wxMutexInternal::TryLock()
{
- wxMacStCritical critical ;
- if ( UMASystemIsInitialized() )
+ wxCHECK_MSG( m_isOk, wxMUTEX_MISC_ERROR, wxT("Invalid Mutex") );
+ OSStatus err = MPWaitOnSemaphore( m_semaphore, kDurationImmediate );
+ if (err != noErr)
{
- ThreadID current = kNoThreadID;
- ::MacGetCurrentThread(¤t);
- // if we are not the owner, give an error back
- if ( m_owner != kNoThreadID && m_owner != current )
+ if (err == kMPTimeoutErr)
return wxMUTEX_BUSY;
- m_owner = current;
+ wxLogSysError( wxT("Could not try lock mutex") );
+
+ return wxMUTEX_MISC_ERROR;
}
- m_locked++;
- return wxMUTEX_NO_ERROR;
+ return wxMUTEX_NO_ERROR;
}
wxMutexError wxMutexInternal::Unlock()
{
- if ( UMASystemIsInitialized() )
+ wxCHECK_MSG( m_isOk, wxMUTEX_MISC_ERROR, wxT("Invalid Mutex") );
+ OSStatus err = MPSignalSemaphore( m_semaphore );
+
+ MPYield();
+ if (err != noErr)
{
- OSErr err;
- err = ::ThreadBeginCritical();
+ wxLogSysError( wxT("Could not unlock mutex") );
+ return wxMUTEX_MISC_ERROR;
+ }
- if (m_locked > 0)
- m_locked--;
+ return wxMUTEX_NO_ERROR;
+}
- // this mutex is not owned by anybody anmore
- m_owner = kNoThreadID;
+#endif
- // now pass on to the first waiting thread
- ThreadID firstWaiting = kNoThreadID;
- bool found = false;
- while (!m_waiters.IsEmpty() && !found)
- {
- firstWaiting = m_waiters[0];
- err = ::SetThreadState(firstWaiting, kReadyThreadState, kNoThreadID);
- // in case this was not successful (dead thread), we just loop on and reset the id
- found = (err != threadNotFoundErr);
- if ( !found )
- firstWaiting = kNoThreadID ;
- m_waiters.RemoveAt(0) ;
- }
- // now we have a valid firstWaiting thread, which has been scheduled to run next, just end the
- // critical section and invoke the scheduler
- err = ::SetThreadStateEndCritical(kCurrentThreadID, kReadyThreadState, firstWaiting);
+#if wxUSE_MAC_CRITICAL_REGION_MUTEX
+
+class wxMutexInternal
+{
+public:
+ wxMutexInternal( wxMutexType mutexType );
+ virtual ~wxMutexInternal();
+
+ bool IsOk() const { return m_isOk; }
+
+ wxMutexError Lock() { return Lock(kDurationForever); }
+ wxMutexError Lock(unsigned long ms);
+ wxMutexError TryLock();
+ wxMutexError Unlock();
+
+private:
+ MPCriticalRegionID m_critRegion;
+ bool m_isOk ;
+};
+
+wxMutexInternal::wxMutexInternal( wxMutexType WXUNUSED(mutexType) )
+{
+ m_isOk = false;
+ m_critRegion = kInvalidID;
+
+ verify_noerr( MPCreateCriticalRegion( &m_critRegion ) );
+ m_isOk = ( m_critRegion != kInvalidID );
+ if ( !IsOk() )
+ {
+ wxFAIL_MSG( wxT("Error when creating mutex") );
}
- else
+}
+
+wxMutexInternal::~wxMutexInternal()
+{
+ if ( m_critRegion != kInvalidID )
+ MPDeleteCriticalRegion( m_critRegion );
+
+ MPYield();
+}
+
+wxMutexError wxMutexInternal::Lock(unsigned long ms)
+{
+ wxCHECK_MSG( m_isOk , wxMUTEX_MISC_ERROR , wxT("Invalid Mutex") );
+
+ OSStatus err = MPEnterCriticalRegion( m_critRegion, ms );
+ switch ( err )
+ {
+ case noErr:
+ break;
+
+ case kMPTimeoutErr:
+ wxASSERT_MSG( ms != kDurationForever, wxT("unexpected timeout") );
+ return wxMUTEX_TIMEOUT;
+
+ default:
+ wxLogSysError(wxT("Could not lock mutex"));
+ return wxMUTEX_MISC_ERROR;
+ }
+
+ return wxMUTEX_NO_ERROR;
+}
+
+wxMutexError wxMutexInternal::TryLock()
+{
+ wxCHECK_MSG( m_isOk , wxMUTEX_MISC_ERROR , wxT("Invalid Mutex") ) ;
+
+ OSStatus err = MPEnterCriticalRegion( m_critRegion, kDurationImmediate);
+ if (err != noErr)
+ {
+ if ( err == kMPTimeoutErr)
+ return wxMUTEX_BUSY;
+
+ wxLogSysError( wxT("Could not try lock mutex") );
+ return wxMUTEX_MISC_ERROR;
+ }
+
+ return wxMUTEX_NO_ERROR;
+}
+
+wxMutexError wxMutexInternal::Unlock()
+{
+ wxCHECK_MSG( m_isOk , wxMUTEX_MISC_ERROR , wxT("Invalid Mutex") ) ;
+
+ OSStatus err = MPExitCriticalRegion( m_critRegion );
+ MPYield() ;
+
+ if (err != noErr)
{
- if (m_locked > 0)
- m_locked--;
+ wxLogSysError( wxT("Could not unlock mutex") );
+
+ return wxMUTEX_MISC_ERROR;
}
+
return wxMUTEX_NO_ERROR;
}
+#endif
+
// --------------------------------------------------------------------------
// wxSemaphore
// --------------------------------------------------------------------------
-// TODO not yet implemented
-
class wxSemaphoreInternal
{
public:
- wxSemaphoreInternal(int initialcount, int maxcount);
- ~wxSemaphoreInternal();
+ wxSemaphoreInternal( int initialcount, int maxcount );
+ virtual ~wxSemaphoreInternal();
- bool IsOk() const { return true ; }
-
- wxSemaError Wait() { return WaitTimeout(INFINITE); }
- wxSemaError TryWait() { return WaitTimeout(0); }
- wxSemaError WaitTimeout(unsigned long milliseconds);
+ bool IsOk() const
+ { return m_isOk; }
wxSemaError Post();
+ wxSemaError WaitTimeout( unsigned long milliseconds );
+
+ wxSemaError Wait()
+ { return WaitTimeout( kDurationForever); }
+
+ wxSemaError TryWait()
+ {
+ wxSemaError err = WaitTimeout( kDurationImmediate );
+ if (err == wxSEMA_TIMEOUT)
+ err = wxSEMA_BUSY;
+
+ return err;
+ }
private:
+ MPSemaphoreID m_semaphore;
+ bool m_isOk;
};
-wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount)
+wxSemaphoreInternal::wxSemaphoreInternal( int initialcount, int maxcount)
{
+ m_isOk = false;
+ m_semaphore = kInvalidID;
if ( maxcount == 0 )
- {
// make it practically infinite
maxcount = INT_MAX;
+
+ verify_noerr( MPCreateSemaphore( maxcount, initialcount, &m_semaphore ) );
+ m_isOk = ( m_semaphore != kInvalidID );
+
+ if ( !IsOk() )
+ {
+ wxFAIL_MSG( wxT("Error when creating semaphore") );
}
}
wxSemaphoreInternal::~wxSemaphoreInternal()
{
+ if (m_semaphore != kInvalidID)
+ MPDeleteSemaphore( m_semaphore );
+
+ MPYield();
}
-wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds)
+wxSemaError wxSemaphoreInternal::WaitTimeout( unsigned long milliseconds )
{
- return wxSEMA_MISC_ERROR;
+ OSStatus err = MPWaitOnSemaphore( m_semaphore, milliseconds );
+ if (err != noErr)
+ {
+ if (err == kMPTimeoutErr)
+ return wxSEMA_TIMEOUT;
+
+ return wxSEMA_MISC_ERROR;
+ }
+
+ return wxSEMA_NO_ERROR;
}
wxSemaError wxSemaphoreInternal::Post()
{
- return wxSEMA_MISC_ERROR;
+ OSStatus err = MPSignalSemaphore( m_semaphore );
+ MPYield();
+ if (err != noErr)
+ return wxSEMA_MISC_ERROR;
+
+ return wxSEMA_NO_ERROR;
}
// ----------------------------------------------------------------------------
// wxCondition implementation
// ----------------------------------------------------------------------------
-// TODO this is not yet completed
+#if 0
class wxConditionInternal
{
public:
- wxConditionInternal(wxMutex& mutex) : m_mutex(mutex)
- {
- m_excessSignals = 0 ;
- }
- ~wxConditionInternal()
+ wxConditionInternal( wxMutex& mutex )
+ :
+ m_mutex( mutex ),
+ m_semaphore( 0, 1 ),
+ m_gate( 1, 1 )
{
+ m_waiters = 0;
+ m_signals = 0;
+ m_canceled = 0;
}
- bool IsOk() const { return m_mutex.IsOk() ; }
-
+ virtual ~wxConditionInternal() {}
+
+ bool IsOk() const
+ { return m_mutex.IsOk(); }
+
wxCondError Wait()
+ { return WaitTimeout( kDurationForever ); }
+
+ wxCondError WaitTimeout( unsigned long msectimeout );
+
+ wxCondError Signal()
+ { return DoSignal( false); }
+
+ wxCondError Broadcast()
+ { return DoSignal( true ); }
+
+private:
+ wxCondError DoSignal( bool signalAll );
+
+ wxMutex& m_mutex;
+ wxSemaphoreInternal m_semaphore; // Signals the waiting threads.
+ wxSemaphoreInternal m_gate;
+ wxCriticalSection m_varSection;
+ size_t m_waiters; // Number of threads waiting for a signal.
+ size_t m_signals; // Number of signals to send.
+ size_t m_canceled; // Number of canceled waiters in m_waiters.
+};
+
+wxCondError wxConditionInternal::WaitTimeout( unsigned long msectimeout )
+{
+ m_gate.Wait();
+
+ if ( ++ m_waiters == INT_MAX )
{
- return WaitTimeout(0xFFFFFFFF );
+ m_varSection.Enter();
+
+ m_waiters -= m_canceled;
+ m_signals -= m_canceled;
+ m_canceled = 0;
+
+ m_varSection.Leave();
}
-
- wxCondError WaitTimeout(unsigned long msectimeout)
+
+ m_gate.Post();
+ m_mutex.Unlock();
+
+ wxSemaError err = m_semaphore.WaitTimeout( msectimeout);
+ wxASSERT( err == wxSEMA_NO_ERROR || err == wxSEMA_TIMEOUT);
+
+ m_varSection.Enter();
+
+ if ( err != wxSEMA_NO_ERROR )
{
- wxMacStCritical critical ;
- if ( m_excessSignals > 0 )
+ if ( m_signals > m_canceled )
{
- --m_excessSignals ;
- return wxCOND_NO_ERROR ;
+ // A signal is being sent after we timed out.
+ if ( m_waiters == m_signals )
+ {
+ // There are no excess waiters to catch the signal, so
+ // we must throw it away.
+ wxSemaError err2 = m_semaphore.Wait();
+ if ( err2 != wxSEMA_NO_ERROR )
+ {
+ wxLogSysError( wx("Error while waiting on semaphore") );
+ }
+
+ wxASSERT( err2 == wxSEMA_NO_ERROR);
+
+ --m_waiters;
+ if ( --m_signals == m_canceled )
+ {
+ // This was the last signal. open the gate.
+ wxASSERT( m_waiters == m_canceled );
+ m_gate.Post();
+ }
+ }
+ else
+ {
+ // There are excess waiters to catch the signal, leave it be.
+ --m_waiters;
+ }
}
- else if ( msectimeout == 0 )
+ else
{
- return wxCOND_MISC_ERROR ;
+ // No signals is being sent:
+ // the gate may be open or closed, so we can't touch m_waiters.
+ ++m_canceled;
+ ++m_signals;
}
- else
+ }
+ else
+ {
+ // We caught a signal.
+ wxASSERT( m_signals > m_canceled );
+
+ --m_waiters;
+
+ if ( --m_signals == m_canceled)
+ {
+ // This was the last signal. open the gate.
+ wxASSERT( m_waiters == m_canceled );
+
+ m_gate.Post();
+ }
+ }
+
+ m_varSection.Leave();
+ m_mutex.Lock();
+
+ if (err != noErr)
+ return err == wxSEMA_TIMEOUT ? wxCOND_TIMEOUT : wxCOND_MISC_ERROR;
+
+ return wxCOND_NO_ERROR;
+}
+
+
+wxCondError wxConditionInternal::DoSignal( bool signalAll)
+{
+ m_gate.Wait();
+ m_varSection.Enter();
+
+ wxASSERT( m_signals == m_canceled );
+
+ if ( m_waiters == m_canceled)
+ {
+ m_varSection.Leave();
+ m_gate.Post();
+ return wxCOND_NO_ERROR;
+ }
+
+ if ( m_canceled > 0)
+ {
+ m_waiters -= m_canceled;
+ m_signals = 0;
+ m_canceled = 0;
+ }
+
+ m_signals = signalAll ? m_waiters : 1;
+ size_t n = m_signals;
+
+ m_varSection.Leave();
+
+ // Let the waiters inherit the gate lock.
+
+ do
+ {
+ wxSemaError err = m_semaphore.Post();
+ wxASSERT( err == wxSEMA_NO_ERROR );
+ }
+ while ( --n );
+
+ return wxCOND_NO_ERROR;
+}
+
+#else
+class wxConditionInternal
+{
+public:
+ wxConditionInternal( wxMutex& mutex );
+
+ bool IsOk() const
+ { return m_mutex.IsOk() && m_semaphore.IsOk(); }
+
+ wxCondError Wait();
+ wxCondError WaitTimeout( unsigned long milliseconds );
+
+ wxCondError Signal();
+ wxCondError Broadcast();
+
+private:
+ // the number of threads currently waiting for this condition
+ SInt32 m_numWaiters;
+
+ // the critical section protecting m_numWaiters
+ wxCriticalSection m_csWaiters;
+
+ wxMutex& m_mutex;
+ wxSemaphore m_semaphore;
+
+ DECLARE_NO_COPY_CLASS(wxConditionInternal)
+};
+
+wxConditionInternal::wxConditionInternal( wxMutex& mutex )
+ : m_mutex(mutex)
+{
+ // another thread can't access it until we return from ctor, so no need to
+ // protect access to m_numWaiters here
+ m_numWaiters = 0;
+}
+
+wxCondError wxConditionInternal::Wait()
+{
+ // increment the number of waiters
+ IncrementAtomic( &m_numWaiters );
+
+ m_mutex.Unlock();
+
+ // a potential race condition can occur here
+ //
+ // after a thread increments nwaiters, and unlocks the mutex and before the
+ // semaphore.Wait() is called, if another thread can cause a signal to be
+ // generated
+ //
+ // this race condition is handled by using a semaphore and incrementing the
+ // semaphore only if 'nwaiters' is greater that zero since the semaphore,
+ // can 'remember' signals the race condition will not occur
+
+ // wait ( if necessary ) and decrement semaphore
+ wxSemaError err = m_semaphore.Wait();
+ m_mutex.Lock();
+
+ return err == wxSEMA_NO_ERROR ? wxCOND_NO_ERROR : wxCOND_MISC_ERROR;
+}
+
+wxCondError wxConditionInternal::WaitTimeout( unsigned long milliseconds )
+{
+ IncrementAtomic( &m_numWaiters );
+
+ m_mutex.Unlock();
+
+ // a race condition can occur at this point in the code
+ //
+ // please see the comments in Wait(), for details
+
+ wxSemaError err = m_semaphore.WaitTimeout(milliseconds);
+
+ if ( err == wxSEMA_TIMEOUT )
+ {
+ // another potential race condition exists here it is caused when a
+ // 'waiting' thread timesout, and returns from WaitForSingleObject, but
+ // has not yet decremented 'nwaiters'.
+ //
+ // at this point if another thread calls signal() then the semaphore
+ // will be incremented, but the waiting thread will miss it.
+ //
+ // to handle this particular case, the waiting thread calls
+ // WaitForSingleObject again with a timeout of 0, after locking
+ // 'nwaiters_mutex'. this call does not block because of the zero
+ // timeout, but will allow the waiting thread to catch the missed
+ // signals.
+ wxCriticalSectionLocker lock(m_csWaiters);
+
+ err = m_semaphore.WaitTimeout(0);
+
+ if ( err != wxSEMA_NO_ERROR )
{
+ m_numWaiters--;
}
- /*
- waiters++;
+ }
- // FIXME this should be MsgWaitForMultipleObjects() as well probably
- DWORD rc = ::WaitForSingleObject(event, timeout);
+ m_mutex.Lock();
- waiters--;
+ return err == wxSEMA_NO_ERROR ? wxCOND_NO_ERROR : wxCOND_MISC_ERROR;
+}
- return rc != WAIT_TIMEOUT;
- */
- return wxCOND_NO_ERROR ;
- }
- wxCondError Signal()
+wxCondError wxConditionInternal::Signal()
+{
+ wxCriticalSectionLocker lock(m_csWaiters);
+
+ if ( m_numWaiters > 0 )
{
- wxMacStCritical critical ;
- return wxCOND_NO_ERROR;
+ // increment the semaphore by 1
+ if ( m_semaphore.Post() != wxSEMA_NO_ERROR )
+ return wxCOND_MISC_ERROR;
+
+ m_numWaiters--;
}
- wxCondError Broadcast()
+ return wxCOND_NO_ERROR;
+}
+
+wxCondError wxConditionInternal::Broadcast()
+{
+ wxCriticalSectionLocker lock(m_csWaiters);
+
+ while ( m_numWaiters > 0 )
{
- wxMacStCritical critical ;
- return wxCOND_NO_ERROR;
- }
+ if ( m_semaphore.Post() != wxSEMA_NO_ERROR )
+ return wxCOND_MISC_ERROR;
- wxArrayLong m_waiters ;
- wxInt32 m_excessSignals ;
- wxMutex& m_mutex;
-};
+ m_numWaiters--;
+ }
+
+ return wxCOND_NO_ERROR;
+}
+#endif
// ----------------------------------------------------------------------------
// wxCriticalSection implementation
// ----------------------------------------------------------------------------
-// it's implemented as a mutex on mac os, so it is defined in the headers
+// XXX currently implemented as mutex in headers. Change to critical section.
// ----------------------------------------------------------------------------
// wxThread implementation
public:
wxThreadInternal()
{
- m_tid = kNoThreadID ;
+ m_tid = kInvalidID;
m_state = STATE_NEW;
- m_priority = WXTHREAD_DEFAULT_PRIORITY;
- }
+ m_prio = WXTHREAD_DEFAULT_PRIORITY;
+ m_notifyQueueId = kInvalidID;
+ m_exitcode = 0;
+ m_cancelled = false ;
- ~wxThreadInternal()
- {
+ // set to true only when the thread starts waiting on m_semSuspend
+ m_isPaused = false;
+
+ // defaults for joinable threads
+ m_shouldBeJoined = true;
+ m_isDetached = false;
}
- void Free()
+ virtual ~wxThreadInternal()
{
+ if ( m_notifyQueueId)
+ {
+ MPDeleteQueue( m_notifyQueueId );
+ m_notifyQueueId = kInvalidID ;
+ }
}
+ // thread function
+ static OSStatus MacThreadStart(void* arg);
+
// create a new (suspended) thread (for the given thread object)
bool Create(wxThread *thread, unsigned int stackSize);
- // suspend/resume/terminate
- bool Suspend();
- bool Resume();
- void Cancel() { m_state = STATE_CANCELED; }
+ // thread actions
- // thread state
- void SetState(wxThreadState state) { m_state = state; }
- wxThreadState GetState() const { return m_state; }
+ // start the thread
+ wxThreadError Run();
- // thread priority
- void SetPriority(unsigned int priority);
- unsigned int GetPriority() const { return m_priority; }
+ // unblock the thread allowing it to run
+ void SignalRun() { m_semRun.Post(); }
- void SetResult( void *res ) { m_result = res ; }
- void *GetResult() { return m_result ; }
+ // ask the thread to terminate
+ void Wait();
- // thread handle and id
- ThreadID GetId() const { return m_tid; }
+ // go to sleep until Resume() is called
+ void Pause();
- // thread function
- static pascal void* MacThreadStart(wxThread* arg);
+ // resume the thread
+ void Resume();
+
+ // accessors
+ // priority
+ int GetPriority() const
+ { return m_prio; }
+ void SetPriority(int prio);
+
+ // state
+ wxThreadState GetState() const
+ { return m_state; }
+ void SetState(wxThreadState state)
+ { m_state = state; }
+
+ // Get the ID of this thread's underlying MP Services task.
+ MPTaskID GetId() const
+ { return m_tid; }
+
+ void SetCancelFlag()
+ { m_cancelled = true; }
+
+ bool WasCancelled() const
+ { return m_cancelled; }
+
+ // exit code
+ void SetExitCode(wxThread::ExitCode exitcode)
+ { m_exitcode = exitcode; }
+ wxThread::ExitCode GetExitCode() const
+ { return m_exitcode; }
+
+ // the pause flag
+ void SetReallyPaused(bool paused)
+ { m_isPaused = paused; }
+ bool IsReallyPaused() const
+ { return m_isPaused; }
+
+ // tell the thread that it is a detached one
+ void Detach()
+ {
+ wxCriticalSectionLocker lock(m_csJoinFlag);
+
+ m_shouldBeJoined = false;
+ m_isDetached = true;
+ }
private:
- wxThreadState m_state; // state, see wxThreadState enum
- unsigned int m_priority; // thread priority in "wx" units
- ThreadID m_tid; // thread id
- void* m_result;
- static ThreadEntryUPP s_threadEntry ;
-};
+ // the thread we're associated with
+ wxThread * m_thread;
+
+ MPTaskID m_tid; // thread id
+ MPQueueID m_notifyQueueId; // its notification queue
+
+ wxThreadState m_state; // see wxThreadState enum
+ int m_prio; // in wxWidgets units: from 0 to 100
+
+ // this flag is set when the thread should terminate
+ bool m_cancelled;
+
+ // this flag is set when the thread is blocking on m_semSuspend
+ bool m_isPaused;
+
+ // the thread exit code - only used for joinable (!detached) threads and
+ // is only valid after the thread termination
+ wxThread::ExitCode m_exitcode;
-static wxArrayPtrVoid s_threads ;
+ // many threads may call Wait(), but only one of them should call
+ // pthread_join(), so we have to keep track of this
+ wxCriticalSection m_csJoinFlag;
+ bool m_shouldBeJoined;
+ bool m_isDetached;
-ThreadEntryUPP wxThreadInternal::s_threadEntry = NULL ;
-pascal void* wxThreadInternal::MacThreadStart(wxThread *thread)
+ // this semaphore is posted by Run() and the threads Entry() is not
+ // called before it is done
+ wxSemaphore m_semRun;
+
+ // this one is signaled when the thread should resume after having been
+ // Pause()d
+ wxSemaphore m_semSuspend;
+};
+
+OSStatus wxThreadInternal::MacThreadStart(void *parameter)
{
- // first of all, check whether we hadn't been cancelled already
- if ( thread->m_internal->GetState() == STATE_EXITED )
+ wxThread* thread = (wxThread*) parameter ;
+ wxThreadInternal *pthread = thread->m_internal;
+
+ // add to TLS so that This() will work
+ verify_noerr( MPSetTaskStorageValue( gs_tlsForWXThread , (TaskStorageValue) thread ) ) ;
+
+ // have to declare this before pthread_cleanup_push() which defines a
+ // block!
+ bool dontRunAtAll;
+
+ // wait for the semaphore to be posted from Run()
+ pthread->m_semRun.Wait();
+
+ // test whether we should run the run at all - may be it was deleted
+ // before it started to Run()?
{
- return (void*)-1;
- }
+ wxCriticalSectionLocker lock(thread->m_critsect);
- void* rc = thread->Entry();
+ dontRunAtAll = pthread->GetState() == STATE_NEW &&
+ pthread->WasCancelled();
+ }
- // enter m_critsect before changing the thread state
- thread->m_critsect.Enter();
- bool wasCancelled = thread->m_internal->GetState() == STATE_CANCELED;
- thread->m_internal->SetState(STATE_EXITED);
- thread->m_critsect.Leave();
+ if ( !dontRunAtAll )
+ {
+ pthread->m_exitcode = thread->Entry();
- thread->OnExit();
+ {
+ wxCriticalSectionLocker lock(thread->m_critsect);
+ pthread->SetState( STATE_EXITED );
+ }
+ }
- // if the thread was cancelled (from Delete()), then it the handle is still
- // needed there
- if ( thread->IsDetached() && !wasCancelled )
+ if ( dontRunAtAll )
{
- // auto delete
- delete thread;
+ if ( pthread->m_isDetached )
+ delete thread;
+
+ return -1;
}
- //else: the joinable threads handle will be closed when Wait() is done
+ else
+ {
+ // on Mac for the running code,
+ // the correct thread termination is to return
- return rc;
-}
-void wxThreadInternal::SetPriority(unsigned int priority)
-{
- // Priorities don't exist on Mac
+ // terminate the thread
+ thread->Exit( pthread->m_exitcode );
+
+ return (OSStatus) NULL; // pthread->m_exitcode;
+ }
}
-bool wxThreadInternal::Create(wxThread *thread, unsigned int stackSize)
+bool wxThreadInternal::Create( wxThread *thread, unsigned int stackSize )
{
- if ( s_threadEntry == NULL )
- {
- s_threadEntry = NewThreadEntryUPP( (ThreadEntryProcPtr) MacThreadStart ) ;
- }
- OSErr err = NewThread( kCooperativeThread,
- s_threadEntry,
- (void*) thread,
- stackSize,
- kNewSuspend,
- &m_result,
- &m_tid );
+ wxASSERT_MSG( m_state == STATE_NEW && !m_tid,
+ wxT("Create()ing thread twice?") );
- if ( err != noErr )
+ OSStatus err = noErr;
+ m_thread = thread;
+
+ if ( m_notifyQueueId == kInvalidID )
{
- wxLogSysError(_("Can't create thread"));
- return FALSE;
+ OSStatus err = MPCreateQueue( &m_notifyQueueId );
+ if (err != noErr)
+ {
+ wxLogSysError( wxT("Cant create the thread event queue") );
+
+ return false;
+ }
}
- if ( m_priority != WXTHREAD_DEFAULT_PRIORITY )
+ m_state = STATE_NEW;
+
+ err = MPCreateTask(
+ MacThreadStart, (void*)m_thread, stackSize,
+ m_notifyQueueId, &m_exitcode, 0, 0, &m_tid );
+
+ if (err != noErr)
{
- SetPriority(m_priority);
+ wxLogSysError( wxT("Can't create thread") );
+
+ return false;
}
- return TRUE;
+ if ( m_prio != WXTHREAD_DEFAULT_PRIORITY )
+ SetPriority( m_prio );
+
+ return true;
}
-bool wxThreadInternal::Suspend()
+void wxThreadInternal::SetPriority( int priority )
{
- OSErr err ;
+ m_prio = priority;
- ::ThreadBeginCritical();
-
- if ( m_state != STATE_RUNNING )
+ if (m_tid)
{
- ::ThreadEndCritical() ;
- wxLogSysError(_("Can not suspend thread %x"), m_tid);
- return FALSE;
+ // Mac priorities range from 1 to 10,000, with a default of 100.
+ // wxWidgets priorities range from 0 to 100 with a default of 50.
+ // We can map wxWidgets to Mac priorities easily by assuming
+ // the former uses a logarithmic scale.
+ const unsigned int macPriority = (int)( exp( priority / 25.0 * log( 10.0)) + 0.5);
+
+ MPSetTaskWeight( m_tid, macPriority );
}
+}
+
+wxThreadError wxThreadInternal::Run()
+{
+ wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING,
+ wxT("thread may only be started once after Create()") );
- m_state = STATE_PAUSED;
+ SetState( STATE_RUNNING );
- err = ::SetThreadStateEndCritical(m_tid, kStoppedThreadState, kNoThreadID);
+ // wake up threads waiting for our start
+ SignalRun();
- return TRUE;
+ return wxTHREAD_NO_ERROR;
}
-bool wxThreadInternal::Resume()
+void wxThreadInternal::Wait()
{
- ThreadID current ;
- OSErr err ;
- err = MacGetCurrentThread( ¤t ) ;
+ wxCHECK_RET( !m_isDetached, wxT("can't wait for a detached thread") );
- wxASSERT( err == noErr ) ;
- wxASSERT( current != m_tid ) ;
+ // if the thread we're waiting for is waiting for the GUI mutex, we will
+ // deadlock so make sure we release it temporarily
+ if ( wxThread::IsMain() )
+ {
+ // give the thread we're waiting for chance to do the GUI call
+ // it might be in, we don't do this conditionally as the to be waited on
+ // thread might have to acquire the mutex later but before terminating
+ if ( wxGuiOwnedByMainThread() )
+ wxMutexGuiLeave();
+ }
- ::ThreadBeginCritical();
- if ( m_state != STATE_PAUSED && m_state != STATE_NEW )
{
- ::ThreadEndCritical() ;
- wxLogSysError(_("Can not resume thread %x"), m_tid);
- return FALSE;
+ wxCriticalSectionLocker lock(m_csJoinFlag);
+ if ( m_shouldBeJoined )
+ {
+ void *param1, *param2, *rc;
+
+ OSStatus err = MPWaitOnQueue(
+ m_notifyQueueId,
+ ¶m1,
+ ¶m2,
+ &rc,
+ kDurationForever );
+ if (err != noErr)
+ {
+ wxLogSysError( wxT( "Cannot wait for thread termination."));
+ rc = (void*) -1;
+ }
+
+ // actually param1 would be the address of m_exitcode
+ // but we don't need this here
+ m_exitcode = rc;
+
+ m_shouldBeJoined = false;
+ }
}
- err = ::SetThreadStateEndCritical(m_tid, kReadyThreadState, kNoThreadID);
- wxASSERT( err == noErr ) ;
-
- m_state = STATE_RUNNING;
- ::ThreadEndCritical() ;
- ::YieldToAnyThread() ;
- return TRUE;
}
-// static functions
-// ----------------
-wxThread *wxThread::This()
+void wxThreadInternal::Pause()
{
- wxMacStCritical critical ;
+ // the state is set from the thread which pauses us first, this function
+ // is called later so the state should have been already set
+ wxCHECK_RET( m_state == STATE_PAUSED,
+ wxT("thread must first be paused with wxThread::Pause().") );
- ThreadID current ;
- OSErr err ;
+ // wait until the semaphore is Post()ed from Resume()
+ m_semSuspend.Wait();
+}
- err = MacGetCurrentThread( ¤t ) ;
+void wxThreadInternal::Resume()
+{
+ wxCHECK_RET( m_state == STATE_PAUSED,
+ wxT("can't resume thread which is not suspended.") );
- for ( size_t i = 0 ; i < s_threads.Count() ; ++i )
+ // the thread might be not actually paused yet - if there were no call to
+ // TestDestroy() since the last call to Pause() for example
+ if ( IsReallyPaused() )
{
- if ( ( (wxThread*) s_threads[i] )->GetId() == current )
- return (wxThread*) s_threads[i] ;
+ // wake up Pause()
+ m_semSuspend.Post();
+
+ // reset the flag
+ SetReallyPaused( false );
}
- wxLogSysError(_("Couldn't get the current thread pointer"));
- return NULL;
+ SetState( STATE_RUNNING );
}
-bool wxThread::IsMain()
+// static functions
+// ----------------
+
+wxThread *wxThread::This()
{
- ThreadID current ;
- OSErr err ;
+ wxThread* thr = (wxThread*) MPGetTaskStorageValue( gs_tlsForWXThread ) ;
- err = MacGetCurrentThread( ¤t ) ;
- return current == gs_idMainThread;
+ return thr;
+}
+
+bool wxThread::IsMain()
+{
+ return GetCurrentId() == gs_idMainThread || gs_idMainThread == kInvalidID ;
}
#ifdef Yield
void wxThread::Yield()
{
- ::YieldToAnyThread() ;
+ CFRunLoopRunInMode( kCFRunLoopDefaultMode , 0 , true ) ;
+
+ MPYield();
}
-void wxThread::Sleep(unsigned long milliseconds)
+void wxThread::Sleep( unsigned long milliseconds )
{
- clock_t start = clock() ;
- do
- {
- YieldToAnyThread() ;
- } while( clock() - start < milliseconds / CLOCKS_PER_SEC ) ;
+ AbsoluteTime wakeup = AddDurationToAbsolute( milliseconds, UpTime() );
+ MPDelayUntil( &wakeup );
}
int wxThread::GetCPUCount()
{
- // we will use whatever MP API will be used for the new MP Macs
- return 1;
+ return MPProcessors();
}
unsigned long wxThread::GetCurrentId()
{
- ThreadID current ;
- MacGetCurrentThread( ¤t ) ;
- return (unsigned long)current;
+ return (unsigned long)MPCurrentTaskID();
}
-bool wxThread::SetConcurrency(size_t level)
+bool wxThread::SetConcurrency( size_t WXUNUSED(level) )
{
- wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") );
-
- // ok only for the default one
- if ( level == 0 )
- return 0;
-
- // how many CPUs have we got?
- if ( GetCPUCount() == 1 )
- {
- // don't bother with all this complicated stuff - on a single
- // processor system it doesn't make much sense anyhow
- return level == 1;
- }
-
- return TRUE ;
+ // Cannot be set in MacOS.
+ return false;
}
-// ctor and dtor
-// -------------
-
-wxThread::wxThread(wxThreadKind kind)
+wxThread::wxThread( wxThreadKind kind )
{
+ g_numberOfThreads++;
m_internal = new wxThreadInternal();
- m_isDetached = kind == wxTHREAD_DETACHED;
- s_threads.Add( (void*) this ) ;
+ m_isDetached = (kind == wxTHREAD_DETACHED);
}
wxThread::~wxThread()
{
- s_threads.Remove( (void*) this ) ;
- delete m_internal;
-}
+ wxASSERT_MSG( g_numberOfThreads>0 , wxT("More threads deleted than created.") ) ;
+
+ g_numberOfThreads--;
+
+#ifdef __WXDEBUG__
+ m_critsect.Enter();
+
+ // check that the thread either exited or couldn't be created
+ if ( m_internal->GetState() != STATE_EXITED &&
+ m_internal->GetState() != STATE_NEW )
+ {
+ wxLogDebug(
+ wxT("The thread %ld is being destroyed although it is still running! The application may crash."),
+ GetId() );
+ }
+
+ m_critsect.Leave();
+#endif
-// create/start thread
-// -------------------
+ wxDELETE( m_internal ) ;
+}
-wxThreadError wxThread::Create(unsigned int stackSize)
+wxThreadError wxThread::Create( unsigned int stackSize )
{
wxCriticalSectionLocker lock(m_critsect);
+ if ( m_isDetached )
+ m_internal->Detach() ;
+
if ( !m_internal->Create(this, stackSize) )
+ {
+ m_internal->SetState( STATE_EXITED );
+
return wxTHREAD_NO_RESOURCE;
+ }
return wxTHREAD_NO_ERROR;
}
{
wxCriticalSectionLocker lock(m_critsect);
- if ( m_internal->GetState() != STATE_NEW )
- {
- // actually, it may be almost any state at all, not only STATE_RUNNING
- return wxTHREAD_RUNNING;
- }
+ wxCHECK_MSG( m_internal->GetId(), wxTHREAD_MISC_ERROR,
+ wxT("must call wxThread::Create() first") );
- // the thread has just been created and is still suspended - let it run
- return Resume();
+ return m_internal->Run();
}
-// suspend/resume thread
-// ---------------------
+// -----------------------------------------------------------------------------
+// pause/resume
+// -----------------------------------------------------------------------------
wxThreadError wxThread::Pause()
{
- wxCriticalSectionLocker lock(m_critsect);
+ wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR,
+ _T("a thread can't pause itself") );
- return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
-}
-
-wxThreadError wxThread::Resume()
-{
wxCriticalSectionLocker lock(m_critsect);
- return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
-}
-
-// stopping thread
-// ---------------
-
-wxThread::ExitCode wxThread::Wait()
-{
- // although under MacOS we can wait for any thread, it's an error to
- // wait for a detached one in wxWin API
- wxCHECK_MSG( !IsDetached(), (ExitCode)-1,
- _T("can't wait for detached thread") );
-
- ExitCode rc = (ExitCode)-1;
+ if ( m_internal->GetState() != STATE_RUNNING )
+ {
+ wxLogDebug( wxT("Can't pause thread which is not running.") );
- (void)Delete(&rc);
+ return wxTHREAD_NOT_RUNNING;
+ }
- m_internal->Free();
+ // just set a flag, the thread will be really paused only during the next
+ // call to TestDestroy()
+ m_internal->SetState( STATE_PAUSED );
- return rc;
+ return wxTHREAD_NO_ERROR;
}
-wxThreadError wxThread::Delete(ExitCode *pRc)
+wxThreadError wxThread::Resume()
{
- ExitCode rc = 0;
+ wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR,
+ wxT("a thread can't resume itself") );
- // Delete() is always safe to call, so consider all possible states
+ wxCriticalSectionLocker lock(m_critsect);
- // has the thread started to run?
- bool shouldResume = FALSE;
+ wxThreadState state = m_internal->GetState();
+ switch ( state )
{
- wxCriticalSectionLocker lock(m_critsect);
+ case STATE_PAUSED:
+ m_internal->Resume();
+ return wxTHREAD_NO_ERROR;
- if ( m_internal->GetState() == STATE_NEW )
- {
- // WinThreadStart() will see it and terminate immediately
- m_internal->SetState(STATE_EXITED);
+ case STATE_EXITED:
+ return wxTHREAD_NO_ERROR;
- shouldResume = TRUE;
- }
+ default:
+ wxLogDebug( wxT("Attempt to resume a thread which is not paused.") );
+
+ return wxTHREAD_MISC_ERROR;
}
+}
- // is the thread paused?
- if ( shouldResume || IsPaused() )
- Resume();
+// -----------------------------------------------------------------------------
+// exiting thread
+// -----------------------------------------------------------------------------
- // does is still run?
- if ( IsRunning() )
- {
- if ( IsMain() )
- {
- // set flag for wxIsWaitingForThread()
- gs_waitingForThread = TRUE;
+wxThread::ExitCode wxThread::Wait()
+{
+ wxCHECK_MSG( This() != this, (ExitCode)-1,
+ wxT("a thread can't wait for itself") );
-#if wxUSE_GUI
- wxBeginBusyCursor();
-#endif // wxUSE_GUI
- }
+ wxCHECK_MSG( !m_isDetached, (ExitCode)-1,
+ wxT("can't wait for detached thread") );
- // ask the thread to terminate
- {
- wxCriticalSectionLocker lock(m_critsect);
+ m_internal->Wait();
- m_internal->Cancel();
- }
+ return m_internal->GetExitCode();
+}
-#if wxUSE_GUI
- // simply wait for the thread to terminate
- while( TestDestroy() )
- {
- ::YieldToAnyThread() ;
- }
-#else // !wxUSE_GUI
- // simply wait for the thread to terminate
- while( TestDestroy() )
- {
- ::YieldToAnyThread() ;
- }
-#endif // wxUSE_GUI/!wxUSE_GUI
+wxThreadError wxThread::Delete(ExitCode *rc)
+{
+ wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR,
+ wxT("a thread can't delete itself") );
- if ( IsMain() )
- {
- gs_waitingForThread = FALSE;
+ bool isDetached = m_isDetached;
-#if wxUSE_GUI
- wxEndBusyCursor();
-#endif // wxUSE_GUI
- }
- }
+ m_critsect.Enter();
+ wxThreadState state = m_internal->GetState();
- // if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
- {
- wxLogLastError("GetExitCodeThread");
+ // ask the thread to stop
+ m_internal->SetCancelFlag();
- rc = (ExitCode)-1;
- }
+ m_critsect.Leave();
- if ( IsDetached() )
+ switch ( state )
{
- // if the thread exits normally, this is done in WinThreadStart, but in
- // this case it would have been too early because
- // MsgWaitForMultipleObject() would fail if the therad handle was
- // closed while we were waiting on it, so we must do it here
- delete this;
+ case STATE_NEW:
+ // we need to wake up the thread so that PthreadStart() will
+ // terminate - right now it's blocking on run semaphore in
+ // PthreadStart()
+ m_internal->SignalRun();
+
+ // fall through
+
+ case STATE_EXITED:
+ // nothing to do
+ break;
+
+ case STATE_PAUSED:
+ // resume the thread first
+ m_internal->Resume();
+
+ // fall through
+
+ default:
+ if ( !isDetached )
+ {
+ // wait until the thread stops
+ m_internal->Wait();
+
+ if ( rc )
+ {
+ // return the exit code of the thread
+ *rc = m_internal->GetExitCode();
+ }
+ }
}
- // wxASSERT_MSG( (DWORD)rc != STILL_ACTIVE,
- // wxT("thread must be already terminated.") );
-
- if ( pRc )
- *pRc = rc;
-
- return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
+ return wxTHREAD_NO_ERROR;
}
wxThreadError wxThread::Kill()
{
- if ( !IsRunning() )
- return wxTHREAD_NOT_RUNNING;
+ wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR,
+ wxT("a thread can't kill itself") );
-// if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) )
+ switch ( m_internal->GetState() )
{
- wxLogSysError(_("Couldn't terminate thread"));
-
- return wxTHREAD_MISC_ERROR;
+ case STATE_NEW:
+ case STATE_EXITED:
+ return wxTHREAD_NOT_RUNNING;
+
+ case STATE_PAUSED:
+ // resume the thread first
+ Resume();
+
+ // fall through
+
+ default:
+ OSStatus err = MPTerminateTask( m_internal->GetId() , -1 ) ;
+ if (err != noErr)
+ {
+ wxLogError( wxT("Failed to terminate a thread.") );
+
+ return wxTHREAD_MISC_ERROR;
+ }
+
+ if ( m_isDetached )
+ {
+ delete this ;
+ }
+ else
+ {
+ // this should be retrieved by Wait actually
+ m_internal->SetExitCode( (void*)-1 );
+ }
+
+ return wxTHREAD_NO_ERROR;
}
+}
+
+void wxThread::Exit( ExitCode status )
+{
+ wxASSERT_MSG( This() == this,
+ wxT("wxThread::Exit() can only be called in the context of the same thread") );
+
+ // don't enter m_critsect before calling OnExit() because the user code
+ // might deadlock if, for example, it signals a condition in OnExit() (a
+ // common case) while the main thread calls any of functions entering
+ // m_critsect on us (almost all of them do)
+ OnExit();
- m_internal->Free();
+ MPTaskID threadid = m_internal->GetId();
if ( IsDetached() )
{
delete this;
}
+ else // joinable
+ {
+ // update the status of the joinable thread
+ wxCriticalSectionLocker lock( m_critsect );
+ m_internal->SetState( STATE_EXITED );
+ }
- return wxTHREAD_NO_ERROR;
+ MPTerminateTask( threadid, (long)status );
}
-void wxThread::Exit(ExitCode status)
+// also test whether we were paused
+bool wxThread::TestDestroy()
{
- m_internal->Free();
+ wxASSERT_MSG( This() == this,
+ wxT("wxThread::TestDestroy() can only be called in the context of the same thread") );
- if ( IsDetached() )
+ m_critsect.Enter();
+
+ if ( m_internal->GetState() == STATE_PAUSED )
{
- delete this;
- }
+ m_internal->SetReallyPaused( true );
- m_internal->SetResult( status ) ;
+ // leave the crit section or the other threads will stop too if they attempt
+ // to call any of (seemingly harmless) IsXXX() functions while we sleep
+ m_critsect.Leave();
-/*
-#if defined(__VISUALC__) || (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500))
- _endthreadex((unsigned)status);
-#else // !VC++
- ::ExitThread((DWORD)status);
-#endif // VC++/!VC++
-*/
- wxFAIL_MSG(wxT("Couldn't return from ExitThread()!"));
+ m_internal->Pause();
+ }
+ else
+ {
+ // thread wasn't requested to pause, nothing to do
+ m_critsect.Leave();
+ }
+
+ return m_internal->WasCancelled();
}
+// -----------------------------------------------------------------------------
// priority setting
-// ----------------
-
-// since all these calls are execute cooperatively we don't have to use the critical section
+// -----------------------------------------------------------------------------
void wxThread::SetPriority(unsigned int prio)
{
- m_internal->SetPriority(prio);
+ wxCHECK_RET( ((int)WXTHREAD_MIN_PRIORITY <= (int)prio) &&
+ ((int)prio <= (int)WXTHREAD_MAX_PRIORITY),
+ wxT("invalid thread priority") );
+
+ wxCriticalSectionLocker lock(m_critsect);
+
+ switch ( m_internal->GetState() )
+ {
+ case STATE_RUNNING:
+ case STATE_PAUSED:
+ case STATE_NEW:
+ // thread not yet started, priority will be set when it is
+ m_internal->SetPriority( prio );
+ break;
+
+ case STATE_EXITED:
+ default:
+ wxFAIL_MSG( wxT("impossible to set thread priority in this state") );
+ }
}
unsigned int wxThread::GetPriority() const
{
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
+
return m_internal->GetPriority();
}
unsigned long wxThread::GetId() const
{
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
+
return (unsigned long)m_internal->GetId();
}
+// -----------------------------------------------------------------------------
+// state tests
+// -----------------------------------------------------------------------------
+
bool wxThread::IsRunning() const
{
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
return m_internal->GetState() == STATE_RUNNING;
}
bool wxThread::IsAlive() const
{
- return (m_internal->GetState() == STATE_RUNNING) ||
- (m_internal->GetState() == STATE_PAUSED);
+ wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect);
+
+ switch ( m_internal->GetState() )
+ {
+ case STATE_RUNNING:
+ case STATE_PAUSED:
+ return true;
+
+ default:
+ return false;
+ }
}
bool wxThread::IsPaused() const
{
- return m_internal->GetState() == STATE_PAUSED;
-}
+ wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect);
-bool wxThread::TestDestroy()
-{
- return m_internal->GetState() == STATE_CANCELED;
+ return (m_internal->GetState() == STATE_PAUSED);
}
// ----------------------------------------------------------------------------
bool wxThreadModule::OnInit()
{
- long response;
- bool hasThreadManager ;
- hasThreadManager = Gestalt( gestaltThreadMgrAttr, &response) == noErr && response & 1;
-#if !TARGET_CARBON
-#if GENERATINGCFM
- // verify presence of shared library
- hasThreadManager = hasThreadManager && ((Ptr)NewThread != (Ptr)kUnresolvedCFragSymbolAddress);
-#endif
+ bool hasThreadManager =
+#ifdef __LP64__
+ true ; // TODO VERIFY IN NEXT BUILD
+#else
+ MPLibraryIsLoaded();
#endif
+
if ( !hasThreadManager )
{
- wxMessageBox( "Error" , "Thread Support is not available on this System" , wxOK ) ;
- return FALSE ;
+ wxLogError( wxT("MP thread support is not available on this system" ) ) ;
+
+ return false;
}
- // no error return for GetCurrentThreadId()
- MacGetCurrentThread( &gs_idMainThread ) ;
+ // main thread's This() is NULL
+ verify_noerr( MPAllocateTaskStorageIndex( &gs_tlsForWXThread ) ) ;
+ verify_noerr( MPSetTaskStorageValue( gs_tlsForWXThread, 0 ) ) ;
- return TRUE;
+ gs_idMainThread = wxThread::GetCurrentId();
+ gs_critsectWaitingForGui = new wxCriticalSection();
+
+ gs_critsectGui = new wxCriticalSection();
+ gs_critsectGui->Enter();
+
+ return true;
}
void wxThreadModule::OnExit()
{
+ if ( gs_critsectGui )
+ {
+ if ( !wxGuiOwnedByMainThread() )
+ {
+ gs_critsectGui->Enter();
+ gs_bGuiOwnedByMainThread = true;
+ }
+
+ gs_critsectGui->Leave();
+ delete gs_critsectGui;
+ gs_critsectGui = NULL;
+ }
+
+ delete gs_critsectWaitingForGui;
+ gs_critsectWaitingForGui = NULL;
}
// ----------------------------------------------------------------------------
-// under MacOS we don't have currently preemptive threads, so any thread may access
-// the GUI at any time
+// GUI Serialization copied from MSW implementation
// ----------------------------------------------------------------------------
-void WXDLLEXPORT wxMutexGuiEnter()
+void WXDLLIMPEXP_BASE wxMutexGuiEnter()
{
+ // this would dead lock everything...
+ wxASSERT_MSG( !wxThread::IsMain(),
+ wxT("main thread doesn't want to block in wxMutexGuiEnter()!") );
+
+ // the order in which we enter the critical sections here is crucial!!
+
+ // set the flag telling to the main thread that we want to do some GUI
+ {
+ wxCriticalSectionLocker enter(*gs_critsectWaitingForGui);
+
+ gs_nWaitingForGui++;
+ }
+
+ wxWakeUpMainThread();
+
+ // now we may block here because the main thread will soon let us in
+ // (during the next iteration of OnIdle())
+ gs_critsectGui->Enter();
}
-void WXDLLEXPORT wxMutexGuiLeave()
+void WXDLLIMPEXP_BASE wxMutexGuiLeave()
{
+ wxCriticalSectionLocker enter(*gs_critsectWaitingForGui);
+
+ if ( wxThread::IsMain() )
+ {
+ gs_bGuiOwnedByMainThread = false;
+ }
+ else
+ {
+ // decrement the number of threads waiting for GUI access now
+ wxASSERT_MSG( gs_nWaitingForGui > 0,
+ wxT("calling wxMutexGuiLeave() without entering it first?") );
+
+ gs_nWaitingForGui--;
+
+ wxWakeUpMainThread();
+ }
+
+ gs_critsectGui->Leave();
}
-void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
+void WXDLLIMPEXP_BASE wxMutexGuiLeaveOrEnter()
{
+ wxASSERT_MSG( wxThread::IsMain(),
+ wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") );
+
+ if ( !gs_critsectWaitingForGui )
+ return;
+
+ wxCriticalSectionLocker enter(*gs_critsectWaitingForGui);
+
+ if ( gs_nWaitingForGui == 0 )
+ {
+ // no threads are waiting for GUI - so we may acquire the lock without
+ // any danger (but only if we don't already have it)
+ if ( !wxGuiOwnedByMainThread() )
+ {
+ gs_critsectGui->Enter();
+
+ gs_bGuiOwnedByMainThread = true;
+ }
+ //else: already have it, nothing to do
+ }
+ else
+ {
+ // some threads are waiting, release the GUI lock if we have it
+ if ( wxGuiOwnedByMainThread() )
+ wxMutexGuiLeave();
+ //else: some other worker thread is doing GUI
+ }
}
-bool WXDLLEXPORT wxGuiOwnedByMainThread()
+bool WXDLLIMPEXP_BASE wxGuiOwnedByMainThread()
{
- return false ;
+ return gs_bGuiOwnedByMainThread;
}
// wake up the main thread
void WXDLLEXPORT wxWakeUpMainThread()
{
- wxMacWakeUp() ;
+ wxMacWakeUp();
}
-bool WXDLLEXPORT wxIsWaitingForThread()
-{
- return false ;
-}
+// ----------------------------------------------------------------------------
+// include common implementation code
+// ----------------------------------------------------------------------------
#include "wx/thrimpl.cpp"
#endif // wxUSE_THREADS
-
-// vi:sts=4:sw=4:et
projects / wxWidgets.git / blobdiff