Add unnamed semaphore implementation for Mac OS X

In the past we relied on libosxfuse including a working unnamed semaphore
implmentation for Mac OS X. This will not be the case in future releases of
OSXFUSE, therefore we need to add our own implementation.

1 files changed, 51 insertions, 0 deletions

diff --git a/compat/darwin_compat.h b/compat/darwin_compat.h
new file mode 100644
index 0000000..1cdbcce
--- /dev/null
+++ b/compat/darwin_compat.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2006-2008 Amit Singh/Google Inc.
+ * Copyright (c) 2011-2012 Benjamin Fleischer
+ */
+
+#ifndef _DARWIN_COMPAT_
+#define _DARWIN_COMPAT_
+
+#include <pthread.h>
+
+/* Semaphores */
+
+struct __local_sem_t
+{
+    unsigned int    count;
+    pthread_mutex_t count_lock;
+    pthread_cond_t  count_cond;
+};
+
+typedef struct fuse_sem {
+    int id;
+    union {
+        struct __local_sem_t local;
+    } __data;
+} darwin_sem_t;
+
+#define DARWIN_SEM_VALUE_MAX ((int32_t)32767)
+
+int darwin_sem_init(darwin_sem_t *sem, int pshared, unsigned int value);
+int darwin_sem_destroy(darwin_sem_t *sem);
+int darwin_sem_getvalue(darwin_sem_t *sem, unsigned int *value);
+int darwin_sem_post(darwin_sem_t *sem);
+int darwin_sem_timedwait(darwin_sem_t *sem, const struct timespec *abs_timeout);
+int darwin_sem_trywait(darwin_sem_t *sem);
+int darwin_sem_wait(darwin_sem_t *sem);
+
+/* Caller must not include <semaphore.h> */
+
+typedef darwin_sem_t sem_t;
+
+#define sem_init(s, p, v)   darwin_sem_init(s, p, v)
+#define sem_destroy(s)      darwin_sem_destroy(s)
+#define sem_getvalue(s, v)  darwin_sem_getvalue(s, v)
+#define sem_post(s)         darwin_sem_post(s)
+#define sem_timedwait(s, t) darwin_sem_timedwait(s, t)
+#define sem_trywait(s)      darwin_sem_trywait(s)
+#define sem_wait(s)         darwin_sem_wait(s)
+
+#define SEM_VALUE_MAX       DARWIN_SEM_VALUE_MAX
+
+#endif /* _DARWIN_COMPAT_ */