symbian-qemu-0.9.1-12/python-2.6.1/Python/thread_atheos.h
author William Roberts <williamr@symbian.org>
Wed, 07 Jul 2010 22:30:23 +0100
branchGCC_SURGE
changeset 88 3c15ef939dd3
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Revised fix for Bug 3162 - can't use #ifdef GCCE in ROM building files, so just comment out the line for now
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/* Threading for AtheOS.
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   Based on thread_beos.h. */
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#include <atheos/threads.h>
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#include <atheos/semaphore.h>
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#include <atheos/atomic.h>
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#include <errno.h>
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#include <string.h>
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/* Missing decl from threads.h */
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extern int exit_thread(int);
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/* Undefine FASTLOCK to play with simple semaphores. */
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#define FASTLOCK
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#ifdef FASTLOCK
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/* Use an atomic counter and a semaphore for maximum speed. */
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typedef struct fastmutex {
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	sem_id sem;
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	atomic_t count;
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} fastmutex_t;
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static int fastmutex_create(const char *name, fastmutex_t * mutex);
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static int fastmutex_destroy(fastmutex_t * mutex);
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static int fastmutex_lock(fastmutex_t * mutex);
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static int fastmutex_timedlock(fastmutex_t * mutex, bigtime_t timeout);
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static int fastmutex_unlock(fastmutex_t * mutex);
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static int fastmutex_create(const char *name, fastmutex_t * mutex)
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{
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	mutex->count = 0;
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	mutex->sem = create_semaphore(name, 0, 0);
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	return (mutex->sem < 0) ? -1 : 0;
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}
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static int fastmutex_destroy(fastmutex_t * mutex)
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{
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	if (fastmutex_timedlock(mutex, 0) == 0 || errno == EWOULDBLOCK) {
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		return delete_semaphore(mutex->sem);
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	}
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	return 0;
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}
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static int fastmutex_lock(fastmutex_t * mutex)
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{
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	atomic_t prev = atomic_add(&mutex->count, 1);
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	if (prev > 0)
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		return lock_semaphore(mutex->sem);
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	return 0;
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}
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static int fastmutex_timedlock(fastmutex_t * mutex, bigtime_t timeout)
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{
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	atomic_t prev = atomic_add(&mutex->count, 1);
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	if (prev > 0)
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		return lock_semaphore_x(mutex->sem, 1, 0, timeout);
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	return 0;
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}
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static int fastmutex_unlock(fastmutex_t * mutex)
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{
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	atomic_t prev = atomic_add(&mutex->count, -1);
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	if (prev > 1)
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		return unlock_semaphore(mutex->sem);
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	return 0;
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}
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#endif				/* FASTLOCK */
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/*
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 * Initialization.
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 *
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 */
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static void PyThread__init_thread(void)
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{
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	/* Do nothing. */
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	return;
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}
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/*
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 * Thread support.
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 *
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 */
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static atomic_t thread_count = 0;
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long PyThread_start_new_thread(void (*func) (void *), void *arg)
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{
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	status_t success = -1;
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	thread_id tid;
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	char name[OS_NAME_LENGTH];
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	atomic_t this_thread;
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	dprintf(("PyThread_start_new_thread called\n"));
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	this_thread = atomic_add(&thread_count, 1);
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	PyOS_snprintf(name, sizeof(name), "python thread (%d)", this_thread);
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	tid = spawn_thread(name, func, NORMAL_PRIORITY, 0, arg);
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	if (tid < 0) {
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		dprintf(("PyThread_start_new_thread spawn_thread failed: %s\n", strerror(errno)));
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	} else {
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		success = resume_thread(tid);
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		if (success < 0) {
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			dprintf(("PyThread_start_new_thread resume_thread failed: %s\n", strerror(errno)));
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		}
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	}
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	return (success < 0 ? -1 : tid);
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}
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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long PyThread_get_thread_ident(void)
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{
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	return get_thread_id(NULL);
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}
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static void do_PyThread_exit_thread(int no_cleanup)
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{
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	dprintf(("PyThread_exit_thread called\n"));
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	/* Thread-safe way to read a variable without a mutex: */
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	if (atomic_add(&thread_count, 0) == 0) {
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		/* No threads around, so exit main(). */
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		if (no_cleanup)
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			_exit(0);
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		else
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			exit(0);
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	} else {
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		/* We're a thread */
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		exit_thread(0);
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	}
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}
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void PyThread_exit_thread(void)
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{
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	do_PyThread_exit_thread(0);
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}
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void PyThread__exit_thread(void)
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{
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	do_PyThread_exit_thread(1);
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}
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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#ifndef NO_EXIT_PROG
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static void do_PyThread_exit_prog(int status, int no_cleanup)
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{
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	dprintf(("PyThread_exit_prog(%d) called\n", status));
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	/* No need to do anything, the threads get torn down if main()exits. */
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	if (no_cleanup)
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		_exit(status);
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	else
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		exit(status);
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}
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void PyThread_exit_prog(int status)
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{
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   176
	do_PyThread_exit_prog(status, 0);
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}
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void PyThread__exit_prog(int status)
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   181
{
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   182
	do_PyThread_exit_prog(status, 1);
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   183
}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   184
#endif				/* NO_EXIT_PROG */
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   186
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   187
/*
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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 * Lock support.
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   189
 *
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   190
 */
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   191
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static atomic_t lock_count = 0;
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   194
PyThread_type_lock PyThread_allocate_lock(void)
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   195
{
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   196
#ifdef FASTLOCK
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   197
	fastmutex_t *lock;
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diff changeset
   198
#else
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diff changeset
   199
	sem_id sema;
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   200
#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   201
	char name[OS_NAME_LENGTH];
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diff changeset
   202
	atomic_t this_lock;
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   203
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   204
	dprintf(("PyThread_allocate_lock called\n"));
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   205
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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#ifdef FASTLOCK
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   207
	lock = (fastmutex_t *) malloc(sizeof(fastmutex_t));
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   208
	if (lock == NULL) {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   209
		dprintf(("PyThread_allocate_lock failed: out of memory\n"));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   210
		return (PyThread_type_lock) NULL;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   211
	}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   212
#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   213
	this_lock = atomic_add(&lock_count, 1);
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   214
	PyOS_snprintf(name, sizeof(name), "python lock (%d)", this_lock);
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parents:
diff changeset
   215
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   216
#ifdef FASTLOCK
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   217
	if (fastmutex_create(name, lock) < 0) {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   218
		dprintf(("PyThread_allocate_lock failed: %s\n",
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   219
			 strerror(errno)));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   220
		free(lock);
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   221
		lock = NULL;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   222
	}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   223
	dprintf(("PyThread_allocate_lock()-> %p\n", lock));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   224
	return (PyThread_type_lock) lock;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   225
#else
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   226
	sema = create_semaphore(name, 1, 0);
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   227
	if (sema < 0) {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   228
		dprintf(("PyThread_allocate_lock failed: %s\n",
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   229
			 strerror(errno)));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   230
		sema = 0;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   231
	}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   232
	dprintf(("PyThread_allocate_lock()-> %p\n", sema));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   233
	return (PyThread_type_lock) sema;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   234
#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   235
}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   236
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   237
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   238
void PyThread_free_lock(PyThread_type_lock lock)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   239
{
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   240
	dprintf(("PyThread_free_lock(%p) called\n", lock));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   241
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   242
#ifdef FASTLOCK
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   243
	if (fastmutex_destroy((fastmutex_t *) lock) < 0) {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   244
		dprintf(("PyThread_free_lock(%p) failed: %s\n", lock,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   245
			 strerror(errno)));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   246
	}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   247
	free(lock);
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   248
#else
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	if (delete_semaphore((sem_id) lock) < 0) {
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		dprintf(("PyThread_free_lock(%p) failed: %s\n", lock,
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			 strerror(errno)));
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	}
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#endif
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}
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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{
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	int retval;
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	dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock,
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		 waitflag));
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#ifdef FASTLOCK
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	if (waitflag)
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		retval = fastmutex_lock((fastmutex_t *) lock);
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	else
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		retval = fastmutex_timedlock((fastmutex_t *) lock, 0);
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#else
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	if (waitflag)
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		retval = lock_semaphore((sem_id) lock);
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	else
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		retval = lock_semaphore_x((sem_id) lock, 1, 0, 0);
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#endif
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	if (retval < 0) {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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		dprintf(("PyThread_acquire_lock(%p, %d) failed: %s\n",
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			 lock, waitflag, strerror(errno)));
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	}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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	dprintf(("PyThread_acquire_lock(%p, %d)-> %d\n", lock, waitflag,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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		 retval));
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	return retval < 0 ? 0 : 1;
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}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   283
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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void PyThread_release_lock(PyThread_type_lock lock)
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{
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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	dprintf(("PyThread_release_lock(%p) called\n", lock));
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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#ifdef FASTLOCK
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	if (fastmutex_unlock((fastmutex_t *) lock) < 0) {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   291
		dprintf(("PyThread_release_lock(%p) failed: %s\n", lock,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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			 strerror(errno)));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   293
	}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   294
#else
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   295
	if (unlock_semaphore((sem_id) lock) < 0) {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   296
		dprintf(("PyThread_release_lock(%p) failed: %s\n", lock,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   297
			 strerror(errno)));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   298
	}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   299
#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   300
}