Based on code by Yuri Dario, http://svn.netlabs.org/repos/ports/pthread/trunk
Signed-off-by: Dave Yeo <daver...@telus.net>
---
compat/os2threads.h | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/compat/os2threads.h b/compat/os2threads.h
index 5b6ca55..7f2c925 100644
--- a/compat/os2threads.h
+++ b/compat/os2threads.h
@@ -31,9 +31,18 @@
#undef __STRICT_ANSI__ /* for _beginthread() */
#include <stdlib.h>
+#include <sys/builtin.h>
#include "libavutil/mem.h"
+/*
+ * Boolean values to make us independent of system includes.
+ */
+enum {
+ PTW32_FALSE = 0,
+ PTW32_TRUE = (! PTW32_FALSE)
+};
+
typedef TID pthread_t;
typedef void pthread_attr_t;
@@ -47,6 +56,19 @@ typedef struct {
typedef void pthread_condattr_t;
+typedef struct pthread_once_t_ pthread_once_t;
+
+#define PTHREAD_ONCE_INIT {0}
+
+struct pthread_once_t_
+{
+ unsigned done; /* indicates if user function has
been executed */
+ pthread_mutex_t lock;
+ int reserved1;
+ int reserved2;
+};
+
+
struct thread_arg {
void *(*start_routine)(void *);
void *arg;
@@ -163,4 +185,27 @@ static av_always_inline int
pthread_cond_wait(pthread_cond_t *cond, pthread_mute
return 0;
}
+static av_always_inline int pthread_once(pthread_once_t *once_control, void
(*init_routine)(void))
+{
+ if (once_control == NULL || init_routine == NULL)
+ {
+ return EINVAL;
+ }
+
+ if (__atomic_cmpxchg32((unsigned*)&once_control->done, 0, 0)) /* MBR
fence */
+ {
+ pthread_mutex_lock(&once_control->lock);
+
+ if (!once_control->done)
+ {
+ (*init_routine)();
+ once_control->done = PTW32_TRUE;
+ }
+
+ pthread_mutex_unlock(&once_control->lock);
+ }
+
+ return 0;
+}
+
#endif /* AVCODEC_OS2PTHREADS_H */
--
2.0.0
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