From 72b7f4212f16326c465dcace478b2d679ea4e507 Mon Sep 17 00:00:00 2001
From: "Michael I. Bushnell" <mib@gnu.org>
Date: Wed, 30 Aug 1995 15:51:41 +0000
Subject: (condition_implies, condition_unimplies): New functions. (struct
 condition): New member `implications'. (cond_imp): New structure.
 (cond_signal): Return int now. (condition_broadcast): Always call
 cond_broadcast if this condition has implications. (condition_signal): Always
 call cond_signal if this condition has implications.

---
 libthreads/cthreads.h | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

(limited to 'libthreads')

diff --git a/libthreads/cthreads.h b/libthreads/cthreads.h
index 08394ae5..38d88545 100644
--- a/libthreads/cthreads.h
+++ b/libthreads/cthreads.h
@@ -26,6 +26,9 @@
 /*
  * HISTORY
  * $Log: cthreads.h,v $
+ * Revision 1.8  1995/08/30 15:10:23  mib
+ * (hurd_condition_wait): Provide declaration.
+ *
  * Revision 1.7  1995/07/18 17:15:51  mib
  * Reverse previous change.
  *
@@ -374,8 +377,15 @@ typedef struct condition {
 	spin_lock_t lock;
 	struct cthread_queue queue;
 	char *name;
+	struct cond_imp *implications;
 } *condition_t;
 
+struct cond_imp
+{
+  struct condition *implicatand;
+  struct cond_imp *next;
+};
+
 #define	CONDITION_INITIALIZER		{ SPIN_LOCK_INITIALIZER, QUEUE_INITIALIZER, 0 }
 
 #define	condition_alloc()		((condition_t) calloc(1, sizeof(struct condition)))
@@ -399,19 +409,19 @@ typedef struct condition {
 
 #define	condition_signal(c) \
 	MACRO_BEGIN \
-	if ((c)->queue.head) { \
+	if ((c)->queue.head || (c)->implications) { \
 		cond_signal(c); \
 	} \
 	MACRO_END
 
 #define	condition_broadcast(c) \
 	MACRO_BEGIN \
-	if ((c)->queue.head) { \
+	if ((c)->queue.head || (c)->implications) { \
 		cond_broadcast(c); \
 	} \
 	MACRO_END
 
-extern void
+extern int
 cond_signal C_ARG_DECLS((condition_t c));
 
 extern void
@@ -423,6 +433,12 @@ condition_wait C_ARG_DECLS((condition_t c, mutex_t m));
 extern int
 hurd_condition_wait C_ARG_DECLS((condition_t c, mutex_t m));
 
+extern void
+condition_implies C_ARG_DECLS((condition_t implicator, condition_t implicatand));
+
+extern void
+condition_unimplies C_ARG_DECLS((condition_t implicator, condition_t implicatand));
+
 /*
  * Threads.
  */
-- 
cgit v1.2.3