From 91de97c45aedbd0e2d0fb1cd28dc95a2f51a33c7 Mon Sep 17 00:00:00 2001
From: "wtc%netscape.com"
 <wtc%netscape.com@18797224-902f-48f8-a5cc-f745e15eee43>
Date: Wed, 22 Mar 2000 18:21:12 +0000
Subject: [PATCH] Provide a default implementation of interprocess named
 semaphore functions (which just fail with PR_NOT_IMPLEMENTED_ERROR) if
 neither POSIX nor System V semaphores are supported.  Fixed an error in the
 comments.

git-svn-id: svn://10.0.0.236/trunk@63749 18797224-902f-48f8-a5cc-f745e15eee43
---
 mozilla/nsprpub/pr/src/pthreads/ptsynch.c | 52 ++++++++++++++++++++---
 1 file changed, 47 insertions(+), 5 deletions(-)

diff --git a/mozilla/nsprpub/pr/src/pthreads/ptsynch.c b/mozilla/nsprpub/pr/src/pthreads/ptsynch.c
index b3ff68da05e..5cdd0fd3a8e 100644
--- a/mozilla/nsprpub/pr/src/pthreads/ptsynch.c
+++ b/mozilla/nsprpub/pr/src/pthreads/ptsynch.c
@@ -248,7 +248,7 @@ static PRIntn pt_TimedWait(
 
 
 /*
- * Notifies just get posted to the to the protecting mutex. The
+ * Notifies just get posted to the protecting mutex. The
  * actual notification is done when the lock is released so that
  * MP systems don't contend for a lock that they can't have.
  */
@@ -649,6 +649,14 @@ PR_IMPLEMENT(PRSemaphore*) PR_NewSem(PRUintn value)
     return NULL;
 }
 
+/*
+ * Define the interprocess named semaphore functions.
+ * There are three implementations:
+ * 1. POSIX semaphore based;
+ * 2. System V semaphore based;
+ * 3. unsupported (fails with PR_NOT_IMPLEMENTED_ERROR).
+ */
+
 #ifdef _PR_HAVE_POSIX_SEMAPHORES
 #include <fcntl.h>
 
@@ -750,9 +758,7 @@ PR_IMPLEMENT(PRStatus) PR_DeleteSemaphore(const char *name)
     return PR_SUCCESS;
 }
     
-#endif /* _PR_HAVE_POSIX_SEMAPHORES */
-
-#ifdef _PR_HAVE_SYSV_SEMAPHORES
+#elif defined(_PR_HAVE_SYSV_SEMAPHORES)
 
 #include <fcntl.h>
 #include <sys/sem.h>
@@ -961,7 +967,43 @@ PR_IMPLEMENT(PRStatus) PR_DeleteSemaphore(const char *name)
     return PR_SUCCESS;
 }
 
-#endif /* _PR_HAVE_SYSV_SEMAPHORES */
+#else /* neither POSIX nor System V semaphores are available */
+
+PR_IMPLEMENT(PRSem *) PR_OpenSemaphore(
+    const char *name,
+    PRIntn flags,
+    PRIntn mode,
+    PRUintn value)
+{
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return NULL;
+}
+
+PR_IMPLEMENT(PRStatus) PR_WaitSemaphore(PRSem *sem)
+{
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return PR_FAILURE;
+}
+
+PR_IMPLEMENT(PRStatus) PR_PostSemaphore(PRSem *sem)
+{
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return PR_FAILURE;
+}
+
+PR_IMPLEMENT(PRStatus) PR_CloseSemaphore(PRSem *sem)
+{
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return PR_FAILURE;
+}
+
+PR_IMPLEMENT(PRStatus) PR_DeleteSemaphore(const char *name)
+{
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return PR_FAILURE;
+}
+
+#endif /* end of interprocess named semaphore functions */
 
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