cpython/Python/thread_cthread.h

#ifdef MACH_C_THREADS
#include <mach/cthreads.h>
#endif

#ifdef HURD_C_THREADS
#include <cthreads.h>
#endif

/*
 * Initialization.
 */
static void
PyThread__init_thread(void)
{
#ifndef HURD_C_THREADS
	/* Roland McGrath said this should not be used since this is
	done while linking to threads */
	cthread_init(); 
#else
/* do nothing */
	;
#endif
}

/*
 * Thread support.
 */
long
PyThread_start_new_thread(void (*func)(void *), void *arg)
{
	int success = 0;	/* init not needed when SOLARIS_THREADS and */
				/* C_THREADS implemented properly */

	dprintf(("PyThread_start_new_thread called\n"));
	if (!initialized)
		PyThread_init_thread();
	/* looks like solaris detaches the thread to never rejoin
	 * so well do it here
	 */
	cthread_detach(cthread_fork((cthread_fn_t) func, arg));
	return success < 0 ? -1 : 0;
}

long
PyThread_get_thread_ident(void)
{
	if (!initialized)
		PyThread_init_thread();
	return (long) cthread_self();
}

void
PyThread_exit_thread(void)
{
	dprintf(("PyThread_exit_thread called\n"));
	if (!initialized)
		exit(0);
	cthread_exit(0);
}

/*
 * Lock support.
 */
PyThread_type_lock
PyThread_allocate_lock(void)
{
	mutex_t lock;

	dprintf(("PyThread_allocate_lock called\n"));
	if (!initialized)
		PyThread_init_thread();

	lock = mutex_alloc();
	if (mutex_init(lock)) {
		perror("mutex_init");
		free((void *) lock);
		lock = 0;
	}
	dprintf(("PyThread_allocate_lock() -> %p\n", lock));
	return (PyThread_type_lock) lock;
}

void
PyThread_free_lock(PyThread_type_lock lock)
{
	dprintf(("PyThread_free_lock(%p) called\n", lock));
	mutex_free(lock);
}

int
PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
{
	int success = FALSE;

	dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
	if (waitflag) { 	/* blocking */
		mutex_lock((mutex_t)lock);
		success = TRUE;
	} else {		/* non blocking */
		success = mutex_try_lock((mutex_t)lock);
	}
	dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
	return success;
}

void
PyThread_release_lock(PyThread_type_lock lock)
{
	dprintf(("PyThread_release_lock(%p) called\n", lock));
	mutex_unlock((mutex_t )lock);
}