libpthread-330.250.2.tar.gz

[apple/libpthread.git] / src / pthread_atfork.c

diff --git a/src/pthread_atfork.c b/src/pthread_atfork.c
index b799f3fc04f64d3af4a65635741037ce9374f619..edeec16dbcf2e59f65c96f7fbb27074fb9bd77d7 100644 (file)
--- a/src/pthread_atfork.c
+++ b/src/pthread_atfork.c
@@ -2,14 +2,14 @@
  * Copyright (c) 1999, 2012 Apple Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
- * 
+ *
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
  * compliance with the License. Please obtain a copy of the License at
  * http://www.opensource.apple.com/apsl/ and read it before using this
  * file.
- * 
+ *
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
@@ -17,27 +17,23 @@
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.
- * 
+ *
  * @APPLE_LICENSE_HEADER_END@
  */
 
 #include "internal.h"
 
-#include <libkern/OSAtomic.h>
 #include <mach/mach_init.h>
 #include <mach/mach_vm.h>
 #include <platform/compat.h>
 
-PTHREAD_NOEXPORT void pthread_workqueue_atfork_child(void);
-PTHREAD_NOEXPORT void __pthread_fork_child_internal(pthread_t);
-
 int
 pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
 {
        int res = 0;
        size_t idx;
        pthread_globals_t globals = _pthread_globals();
-       
+
        _PTHREAD_LOCK(globals->pthread_atfork_lock);
        idx = globals->atfork_count++;
 
@@ -79,7 +75,7 @@ pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
        } else if (idx >= PTHREAD_ATFORK_MAX) {
                res = ENOMEM;
        }
- 
+
        if (res == 0) {
                struct pthread_atfork_entry *e = &globals->atfork[idx];
                e->prepare = prepare;
@@ -93,13 +89,13 @@ pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
 
 // Called before the fork(2) system call is made in the parent process.
 // Iterate pthread_atfork prepare handlers.
+// Called first in libSystem_atfork_prepare().
 void
-_pthread_fork_prepare(void)
+_pthread_atfork_prepare_handlers(void)
 {
        pthread_globals_t globals = _pthread_globals();
 
        _PTHREAD_LOCK(globals->pthread_atfork_lock);
-       
        size_t idx;
        for (idx = globals->atfork_count; idx > 0; --idx) {
                struct pthread_atfork_entry *e = &globals->atfork[idx-1];
@@ -107,6 +103,14 @@ _pthread_fork_prepare(void)
                        e->prepare();
                }
        }
+}
+
+// Take pthread-internal locks.
+// Called last in libSystem_atfork_prepare().
+void
+_pthread_atfork_prepare(void)
+{
+       pthread_globals_t globals = _pthread_globals();
 
        _PTHREAD_LOCK(globals->psaved_self_global_lock);
        globals->psaved_self = pthread_self();
@@ -114,14 +118,23 @@ _pthread_fork_prepare(void)
 }
 
 // Called after the fork(2) system call returns to the parent process.
-// Iterate pthread_atfork parent handlers.
+// Release pthread-internal locks
+// Called first in libSystem_atfork_parent().
 void
-_pthread_fork_parent(void)
+_pthread_atfork_parent(void)
 {
        pthread_globals_t globals = _pthread_globals();
 
        _PTHREAD_UNLOCK(globals->psaved_self->lock);
        _PTHREAD_UNLOCK(globals->psaved_self_global_lock);
+}
+
+// Iterate pthread_atfork parent handlers.
+// Called last in libSystem_atfork_parent().
+void
+_pthread_atfork_parent_handlers(void)
+{
+       pthread_globals_t globals = _pthread_globals();
 
        size_t idx;
        for (idx = 0; idx < globals->atfork_count; ++idx) {
@@ -136,19 +149,23 @@ _pthread_fork_parent(void)
 // Called after the fork(2) system call returns to the new child process.
 // Clean up data structures of other threads which no longer exist in the child.
 // Make the current thread the main thread.
+// Called first in libSystem_atfork_child() (after _dyld_fork_child)
 void
-_pthread_fork_child(void)
+_pthread_atfork_child(void)
 {
        pthread_globals_t globals = _pthread_globals();
        _PTHREAD_LOCK_INIT(globals->psaved_self_global_lock);
-       __pthread_fork_child_internal(globals->psaved_self);
        __is_threaded = 0;
-       pthread_workqueue_atfork_child();
+       _pthread_main_thread_postfork_init(globals->psaved_self);
+
+       struct _pthread_registration_data registration_data;
+       _pthread_bsdthread_init(&registration_data);
 }
 
 // Iterate pthread_atfork child handlers.
+// Called last in libSystem_atfork_child().
 void
-_pthread_fork_child_postinit(void)
+_pthread_atfork_child_handlers(void)
 {
        pthread_globals_t globals = _pthread_globals();
        size_t idx;
@@ -160,3 +177,30 @@ _pthread_fork_child_postinit(void)
        }
        _PTHREAD_LOCK_INIT(globals->pthread_atfork_lock);
 }
+
+// Preserve legacy symbols for older iOS simulators
+void
+_pthread_fork_prepare(void)
+{
+       _pthread_atfork_prepare_handlers();
+       _pthread_atfork_prepare();
+}
+
+void
+_pthread_fork_parent(void)
+{
+       _pthread_atfork_parent();
+       _pthread_atfork_parent_handlers();
+}
+
+void
+_pthread_fork_child(void)
+{
+       _pthread_atfork_child();
+}
+
+void
+_pthread_fork_child_postinit(void)
+{
+       _pthread_atfork_child_handlers();
+}