-//-----------------------------------------------------------------------------------
-//
-// class SimpleThread Of course we need a thread class first..
-// This wrapper has a ported implementation.
-//
-//-----------------------------------------------------------------------------------
-class SimpleThread
-{
-public:
- SimpleThread();
- virtual ~SimpleThread();
- int32_t start(void); // start the thread
- UBool isRunning(); // return true if a started thread has exited.
-
- virtual void run(void) = 0; // Override this to provide the code to run
- // in the thread.
- void *fImplementation;
-
-public:
- static void sleep(int32_t millis); // probably shouldn't go here but oh well.
- static void errorFunc(); // Empty function, provides a single convenient place
- // to break on errors.
-};
-
-void SimpleThread::errorFunc() {
- // *(char *)0 = 3; // Force entry into a debugger via a crash;
-}
-
-
-
-
-#ifdef U_WINDOWS
-#define HAVE_IMP
-
-# define VC_EXTRALEAN
-# define WIN32_LEAN_AND_MEAN
-# define NOUSER
-# define NOSERVICE
-# define NOIME
-# define NOMCX
-#include <windows.h>
-#include <process.h>
-
-
-
-//-----------------------------------------------------------------------------------
-//
-// class SimpleThread Windows Implementation
-//
-//-----------------------------------------------------------------------------------
-struct Win32ThreadImplementation
-{
- HANDLE fHandle;
- unsigned int fThreadID;
-};
-
-
-extern "C" unsigned int __stdcall SimpleThreadProc(void *arg)
-{
- ((SimpleThread*)arg)->run();
- return 0;
-}
-
-SimpleThread::SimpleThread()
-:fImplementation(0)
-{
- Win32ThreadImplementation *imp = new Win32ThreadImplementation;
- imp->fHandle = 0;
- fImplementation = imp;
-}
-
-SimpleThread::~SimpleThread()
-{
- // Destructor. Because we start the thread running with _beginthreadex(),
- // we own the Windows HANDLE for the thread and must
- // close it here.
- Win32ThreadImplementation *imp = (Win32ThreadImplementation*)fImplementation;
- if (imp != 0) {
- if (imp->fHandle != 0) {
- CloseHandle(imp->fHandle);
- imp->fHandle = 0;
- }
- }
- delete (Win32ThreadImplementation*)fImplementation;
-}
-
-int32_t SimpleThread::start()
-{
- Win32ThreadImplementation *imp = (Win32ThreadImplementation*)fImplementation;
- if(imp->fHandle != NULL) {
- // The thread appears to have already been started.
- // This is probably an error on the part of our caller.
- return -1;
- }
-
- imp->fHandle = (HANDLE) _beginthreadex(
- NULL, // Security
- 0x20000, // Stack Size
- SimpleThreadProc, // Function to Run
- (void *)this, // Arg List
- 0, // initflag. Start running, not suspended
- &imp->fThreadID // thraddr
- );
-
- if (imp->fHandle == 0) {
- // An error occured
- int err = errno;
- if (err == 0) {
- err = -1;
- }
- return err;
- }
- return 0;
-}
-
-
-UBool SimpleThread::isRunning() {
- //
- // Test whether the thread associated with the SimpleThread object is
- // still actually running.
- //
- // NOTE: on Win64 on Itanium processors, a crashes
- // occur if the main thread of a process exits concurrently with some
- // other thread(s) exiting. To avoid the possibility, we wait until the
- // OS indicates that all threads have terminated, rather than waiting
- // only until the end of the user's Run function has been reached.
- //
- // I don't know whether the crashes represent a Windows bug, or whether
- // main() programs are supposed to have to wait for their threads.
- //
- Win32ThreadImplementation *imp = (Win32ThreadImplementation*)fImplementation;
-
- bool success;
- DWORD threadExitCode;
-
- if (imp->fHandle == 0) {
- // No handle, thread must not be running.
- return FALSE;
- }
- success = GetExitCodeThread(imp->fHandle, &threadExitCode) != 0;
- if (! success) {
- // Can't get status, thread must not be running.
- return FALSE;
- }
- return (threadExitCode == STILL_ACTIVE);
-}
-
-
-void SimpleThread::sleep(int32_t millis)
-{
- ::Sleep(millis);
-}
-
-//-----------------------------------------------------------------------------------
-//
-// class SimpleThread NULL Implementation
-//
-//-----------------------------------------------------------------------------------
-#elif defined XP_MAC
-
-// since the Mac has no preemptive threading (at least on MacOS 8), only
-// cooperative threading, threads are a no-op. We have no yield() calls
-// anywhere in the ICU, so we are guaranteed to be thread-safe.
-
-#define HAVE_IMP
-
-SimpleThread::SimpleThread()
-{}
-
-SimpleThread::~SimpleThread()
-{}
-
-int32_t
-SimpleThread::start()
-{ return 0; }
-
-void
-SimpleThread::run()
-{}
-
-void
-SimpleThread::sleep(int32_t millis)
-{}
-
-UBool
-SimpleThread::isRunning() {
- return FALSE;
-}
-
-#endif
-
-
-//-----------------------------------------------------------------------------------
-//
-// class SimpleThread POSIX implementation
-//
-// A note on the POSIX vs the Windows implementations of this class..
-// On Windows, the main thread must verify that other threads have finished
-// before exiting, or crashes occasionally occur. (Seen on Itanium Win64 only)
-// The function SimpleThread::isRunning() is used for this purpose.
-//
-// On POSIX, there is NO reliable non-blocking mechanism to determine
-// whether a thread has exited. pthread_kill(thread, 0) almost works,
-// but the system can recycle thread ids immediately, so seeing that a
-// thread exists with this call could mean that the original thread has
-// finished and a new one started with the same ID. Useless.
-//
-// So we need to do the check with user code, by setting a flag just before
-// the thread function returns. A technique that is guaranteed to fail
-// on Windows, because it indicates that the thread is done before all
-// system level cleanup has happened.
-//
-//-----------------------------------------------------------------------------------
-#if defined(POSIX)||defined(U_SOLARIS)||defined(U_AIX)||defined(U_HPUX)
-#define HAVE_IMP
-
-struct PosixThreadImplementation
-{
- pthread_t fThread;
- UBool fRunning;
- UBool fRan; /* True if the thread was successfully started */
-};
-
-extern "C" void* SimpleThreadProc(void *arg)
-{
- // This is the code that is run in the new separate thread.
- SimpleThread *This = (SimpleThread *)arg;
- This->run(); // Run the user code.
-
- // The user function has returned. Set the flag indicating that this thread
- // is done. Need a mutex for memory barrier purposes only, so that other thread
- // will reliably see that the flag has changed.
- PosixThreadImplementation *imp = (PosixThreadImplementation*)This->fImplementation;
- umtx_lock(NULL);
- imp->fRunning = FALSE;
- umtx_unlock(NULL);
- return 0;
-}
-
-SimpleThread::SimpleThread()
-{
- PosixThreadImplementation *imp = new PosixThreadImplementation;
- imp->fRunning = FALSE;
- imp->fRan = FALSE;
- fImplementation = imp;
-}
-
-SimpleThread::~SimpleThread()
-{
- PosixThreadImplementation *imp = (PosixThreadImplementation*)fImplementation;
- if (imp->fRan) {
- pthread_join(imp->fThread, NULL);
- }
- delete imp;
- fImplementation = (void *)0xdeadbeef;
-}
-
-int32_t SimpleThread::start()
-{
- int32_t rc;
- static pthread_attr_t attr;
- static UBool attrIsInitialized = FALSE;
-
- PosixThreadImplementation *imp = (PosixThreadImplementation*)fImplementation;
- imp->fRunning = TRUE;
- imp->fRan = TRUE;
-
-#ifdef HPUX_CMA
- if (attrIsInitialized == FALSE) {
- rc = pthread_attr_create(&attr);
- attrIsInitialized = TRUE;
- }
- rc = pthread_create(&(imp->fThread),attr,&SimpleThreadProc,(void*)this);
-#else
- if (attrIsInitialized == FALSE) {
- rc = pthread_attr_init(&attr);
-#if defined(OS390)
- {
- int detachstate = 0; /* jdc30: detach state of zero causes
- threads created with this attr to be in
- an undetached state. An undetached
- thread will keep its resources after
- termination. */
- pthread_attr_setdetachstate(&attr, &detachstate);
- }
-#else
- // pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
- pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
-#endif
- attrIsInitialized = TRUE;
- }
- rc = pthread_create(&(imp->fThread),&attr,&SimpleThreadProc,(void*)this);
-#endif
-
- if (rc != 0) {
- // some kind of error occured, the thread did not start.
- imp->fRan = FALSE;
- imp->fRunning = FALSE;
- }
-
- return rc;
-}
-
-
-UBool
-SimpleThread::isRunning() {
- // Note: Mutex functions are used here not for synchronization,
- // but to force memory barriors to exist, to ensure that one thread
- // can see changes made by another when running on processors
- // with memory models having weak coherency.
- PosixThreadImplementation *imp = (PosixThreadImplementation*)fImplementation;
- umtx_lock(NULL);
- UBool retVal = imp->fRunning;
- umtx_unlock(NULL);
- return retVal;
-}
-
-
-void SimpleThread::sleep(int32_t millis)
-{
-#ifdef U_SOLARIS
- sigignore(SIGALRM);
-#endif
-
-#ifdef HPUX_CMA
- cma_sleep(millis/100);
-#elif defined(U_HPUX) || defined(OS390)
- millis *= 1000;
- while(millis >= 1000000) {
- usleep(999999);
- millis -= 1000000;
- }
- if(millis > 0) {
- usleep(millis);
- }
-#else
- usleep(millis * 1000);
-#endif
-}
-
-#endif
-// end POSIX
projects / apple / icu.git / blobdiff