Patch #488073: AtheOS port.

1 files changed, 300 insertions, 0 deletions

diff --git a/Python/thread_atheos.h b/Python/thread_atheos.h
new file mode 100644
index 0000000..c9f5e23
--- /dev/null
+++ b/Python/thread_atheos.h
@@ -0,0 +1,300 @@
+/* Threading for AtheOS.
+   Based on thread_beos.h. */
+
+#include <atheos/threads.h>
+#include <atheos/semaphore.h>
+#include <atheos/atomic.h>
+#include <errno.h>
+#include <string.h>
+
+/* Missing decl from threads.h */
+extern int exit_thread(int);
+
+
+/* Undefine FASTLOCK to play with simple semaphores. */
+#define FASTLOCK
+
+
+#ifdef FASTLOCK
+
+/* Use an atomic counter and a semaphore for maximum speed. */
+typedef struct fastmutex {
+	sem_id sem;
+	atomic_t count;
+} fastmutex_t;
+
+
+static int fastmutex_create(const char *name, fastmutex_t * mutex);
+static int fastmutex_destroy(fastmutex_t * mutex);
+static int fastmutex_lock(fastmutex_t * mutex);
+static int fastmutex_timedlock(fastmutex_t * mutex, bigtime_t timeout);
+static int fastmutex_unlock(fastmutex_t * mutex);
+
+
+static int fastmutex_create(const char *name, fastmutex_t * mutex)
+{
+	mutex->count = 0;
+	mutex->sem = create_semaphore(name, 0, 0);
+	return (mutex->sem < 0) ? -1 : 0;
+}
+
+
+static int fastmutex_destroy(fastmutex_t * mutex)
+{
+	if (fastmutex_timedlock(mutex, 0) == 0 || errno == EWOULDBLOCK) {
+		return delete_semaphore(mutex->sem);
+	}
+	return 0;
+}
+
+
+static int fastmutex_lock(fastmutex_t * mutex)
+{
+	atomic_t prev = atomic_add(&mutex->count, 1);
+	if (prev > 0)
+		return lock_semaphore(mutex->sem);
+	return 0;
+}
+
+
+static int fastmutex_timedlock(fastmutex_t * mutex, bigtime_t timeout)
+{
+	atomic_t prev = atomic_add(&mutex->count, 1);
+	if (prev > 0)
+		return lock_semaphore_x(mutex->sem, 1, 0, timeout);
+	return 0;
+}
+
+
+static int fastmutex_unlock(fastmutex_t * mutex)
+{
+	atomic_t prev = atomic_add(&mutex->count, -1);
+	if (prev > 1)
+		return unlock_semaphore(mutex->sem);
+	return 0;
+}
+
+
+#endif				/* FASTLOCK */
+
+
+/*
+ * Initialization.
+ *
+ */
+static void PyThread__init_thread(void)
+{
+	/* Do nothing. */
+	return;
+}
+
+
+/*
+ * Thread support.
+ *
+ */
+
+static atomic_t thread_count = 0;
+
+long PyThread_start_new_thread(void (*func) (void *), void *arg)
+{
+	status_t success = -1;
+	thread_id tid;
+	char name[OS_NAME_LENGTH];
+	atomic_t this_thread;
+
+	dprintf(("PyThread_start_new_thread called\n"));
+
+	this_thread = atomic_add(&thread_count, 1);
+	PyOS_snprintf(name, sizeof(name), "python thread (%d)", this_thread);
+
+	tid = spawn_thread(name, func, NORMAL_PRIORITY, 0, arg);
+	if (tid < 0) {
+		dprintf(("PyThread_start_new_thread spawn_thread failed: %s\n", strerror(errno)));
+	} else {
+		success = resume_thread(tid);
+		if (success < 0) {
+			dprintf(("PyThread_start_new_thread resume_thread failed: %s\n", strerror(errno)));
+		}
+	}
+
+	return (success < 0 ? -1 : tid);
+}
+
+
+long PyThread_get_thread_ident(void)
+{
+	return get_thread_id(NULL);
+}
+
+
+static void do_PyThread_exit_thread(int no_cleanup)
+{
+	dprintf(("PyThread_exit_thread called\n"));
+
+	/* Thread-safe way to read a variable without a mutex: */
+	if (atomic_add(&thread_count, 0) == 0) {
+		/* No threads around, so exit main(). */
+		if (no_cleanup)
+			_exit(0);
+		else
+			exit(0);
+	} else {
+		/* We're a thread */
+		exit_thread(0);
+	}
+}
+
+
+void PyThread_exit_thread(void)
+{
+	do_PyThread_exit_thread(0);
+}
+
+
+void PyThread__exit_thread(void)
+{
+	do_PyThread_exit_thread(1);
+}
+
+
+#ifndef NO_EXIT_PROG
+static void do_PyThread_exit_prog(int status, int no_cleanup)
+{
+	dprintf(("PyThread_exit_prog(%d) called\n", status));
+
+	/* No need to do anything, the threads get torn down if main()exits. */
+	if (no_cleanup)
+		_exit(status);
+	else
+		exit(status);
+}
+
+
+void PyThread_exit_prog(int status)
+{
+	do_PyThread_exit_prog(status, 0);
+}
+
+
+void PyThread__exit_prog(int status)
+{
+	do_PyThread_exit_prog(status, 1);
+}
+#endif				/* NO_EXIT_PROG */
+
+
+/*
+ * Lock support.
+ *
+ */
+
+static atomic_t lock_count = 0;
+
+PyThread_type_lock PyThread_allocate_lock(void)
+{
+#ifdef FASTLOCK
+	fastmutex_t *lock;
+#else
+	sem_id sema;
+#endif
+	char name[OS_NAME_LENGTH];
+	atomic_t this_lock;
+
+	dprintf(("PyThread_allocate_lock called\n"));
+
+#ifdef FASTLOCK
+	lock = (fastmutex_t *) malloc(sizeof(fastmutex_t));
+	if (lock == NULL) {
+		dprintf(("PyThread_allocate_lock failed: out of memory\n"));
+		return (PyThread_type_lock) NULL;
+	}
+#endif
+	this_lock = atomic_add(&lock_count, 1);
+	PyOS_snprintf(name, sizeof(name), "python lock (%d)", this_lock);
+
+#ifdef FASTLOCK
+	if (fastmutex_create(name, lock) < 0) {
+		dprintf(("PyThread_allocate_lock failed: %s\n",
+			 strerror(errno)));
+		free(lock);
+		lock = NULL;
+	}
+	dprintf(("PyThread_allocate_lock()-> %p\n", lock));
+	return (PyThread_type_lock) lock;
+#else
+	sema = create_semaphore(name, 1, 0);
+	if (sema < 0) {
+		dprintf(("PyThread_allocate_lock failed: %s\n",
+			 strerror(errno)));
+		sema = 0;
+	}
+	dprintf(("PyThread_allocate_lock()-> %p\n", sema));
+	return (PyThread_type_lock) sema;
+#endif
+}
+
+
+void PyThread_free_lock(PyThread_type_lock lock)
+{
+	dprintf(("PyThread_free_lock(%p) called\n", lock));
+
+#ifdef FASTLOCK
+	if (fastmutex_destroy((fastmutex_t *) lock) < 0) {
+		dprintf(("PyThread_free_lock(%p) failed: %s\n", lock,
+			 strerror(errno)));
+	}
+	free(lock);
+#else
+	if (delete_semaphore((sem_id) lock) < 0) {
+		dprintf(("PyThread_free_lock(%p) failed: %s\n", lock,
+			 strerror(errno)));
+	}
+#endif
+}
+
+
+int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
+{
+	int retval;
+
+	dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock,
+		 waitflag));
+
+#ifdef FASTLOCK
+	if (waitflag)
+		retval = fastmutex_lock((fastmutex_t *) lock);
+	else
+		retval = fastmutex_timedlock((fastmutex_t *) lock, 0);
+#else
+	if (waitflag)
+		retval = lock_semaphore((sem_id) lock);
+	else
+		retval = lock_semaphore_x((sem_id) lock, 1, 0, 0);
+#endif
+	if (retval < 0) {
+		dprintf(("PyThread_acquire_lock(%p, %d) failed: %s\n",
+			 lock, waitflag, strerror(errno)));
+	}
+	dprintf(("PyThread_acquire_lock(%p, %d)-> %d\n", lock, waitflag,
+		 retval));
+	return retval < 0 ? 0 : 1;
+}
+
+
+void PyThread_release_lock(PyThread_type_lock lock)
+{
+	dprintf(("PyThread_release_lock(%p) called\n", lock));
+
+#ifdef FASTLOCK
+	if (fastmutex_unlock((fastmutex_t *) lock) < 0) {
+		dprintf(("PyThread_release_lock(%p) failed: %s\n", lock,
+			 strerror(errno)));
+	}
+#else
+	if (unlock_semaphore((sem_id) lock) < 0) {
+		dprintf(("PyThread_release_lock(%p) failed: %s\n", lock,
+			 strerror(errno)));
+	}
+#endif
+}