posix support initially added

c/src/exec/posix/base/semaphore.h

@@ -0,0 +1,107 @@
+/*  semaphore.h
+ *
+ */
+
+#ifndef __POSIX_SEMAPHORE_h
+#define __POSIX_SEMAPHORE_h
+
+#include <rtems/posix/features.h>
+
+#if defined(_POSIX_SEMAPHORES)
+
+#include <sys/time.h>
+
+/*
+ *  11.1 Semaphore Characteristics, P1003.1b-1993, p.219
+ */
+
+typedef int sem_t;
+
+/*
+ *  11.2.1 Initialize an Unnamed Semaphore, P1003.1b-1993, p.219
+ */
+
+int sem_init(
+  sem_t         *sem,
+  int            pshared,
+  unsigned int   value
+);
+
+/*
+ *  11.2.2 Destroy an Unnamed Semaphore, P1003.1b-1993, p.220
+ */
+
+int sem_destroy(
+  sem_t *sem
+);
+
+/*
+ *  11.2.3 Initialize/Open a Named Semaphore, P1003.1b-1993, p.221
+ *
+ *  NOTE: Follows open() calling conventions.
+ */
+
+sem_t *sem_open(
+  const char *name,
+  int         oflag,
+  ...
+);
+
+/*
+ *  11.2.4 Close a Named Semaphore, P1003.1b-1993, p.224
+ */
+
+int sem_close(
+  sem_t *sem
+);
+
+/*
+ *  11.2.5 Remove a Named Semaphore, P1003.1b-1993, p.225
+ */
+
+int sem_unlink(
+  const char *name
+);
+
+/*
+ *  11.2.6 Lock a Semaphore, P1003.1b-1993, p.226
+ *
+ *  NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27
+ */
+
+int sem_wait(
+  sem_t *sem
+);
+
+int sem_trywait(
+  sem_t *sem
+);
+
+#if defined(_POSIX_TIMEOUTS)
+int sem_timedwait(
+  sem_t                 *sem,
+  const struct timespec *timeout
+);
+#endif
+
+/*
+ *  11.2.7 Unlock a Semaphore, P1003.1b-1993, p.227
+ */
+
+int sem_post(
+  sem_t  *sem
+);
+
+/*
+ *  11.2.8 Get the Value of a Semaphore, P1003.1b-1993, p.229
+ */
+
+int sem_getvalue(
+  sem_t  *sem,
+  int    *sval
+);
+
+#endif   /* _POSIX_SEMAPHORES */
+
+#endif
+/* end of include file */