Implement pthread read/write locks as defined by Version 2 of the Single

UNIX Specification.

As with our standard mutexes, process shared locks are not supported at
this time.

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/libkse/thread/thr_private.h b/lib/libkse/thread/thr_private.h
index 39ce14d..5b76a86 100644
--- a/lib/libkse/thread/thr_private.h
+++ b/lib/libkse/thread/thr_private.h
@@ -224,6 +224,18 @@ struct pthread_key {
 	void            (*destructor) ();
 };
 
+struct pthread_rwlockattr {
+	int		pshared;
+};
+
+struct pthread_rwlock {
+	pthread_mutex_t	lock;	/* monitor lock */
+	int		state;	/* 0 = idle  >0 = # of readers  -1 = writer */
+	pthread_cond_t	read_signal;
+	pthread_cond_t	write_signal;
+	int		blocked_writers;
+};
+
 /*
  * Thread states.
  */