devdraw: draft cocoa support

R=rsc
CC=plan9port.codebot
http://codereview.appspot.com/4974060

1 files changed, 54 insertions, 0 deletions

diff --git a/src/cmd/devdraw/cocoa-thread.c b/src/cmd/devdraw/cocoa-thread.c
new file mode 100644
index 00000000..4b2443ce
--- /dev/null
+++ b/src/cmd/devdraw/cocoa-thread.c
@@ -0,0 +1,54 @@
+#include <u.h>
+#include <libc.h>
+#include "cocoa-thread.h"
+
+static pthread_mutex_t initlock = PTHREAD_MUTEX_INITIALIZER;
+
+void
+qlock(QLock *q)
+{
+	if(q->init == 0){
+		pthread_mutex_lock(&initlock);
+		if(q->init == 0){
+			pthread_mutex_init(&q->m, nil);
+			q->init = 1;
+		}
+		pthread_mutex_unlock(&initlock);
+	}
+	pthread_mutex_lock(&q->m);
+}
+
+void
+qunlock(QLock *q)
+{
+	pthread_mutex_unlock(&q->m);
+}
+
+static void
+rinit(Rendez *r)
+{
+	pthread_mutex_lock(&initlock);
+	if(r->init == 0){
+		pthread_cond_init(&r->c, nil);
+		r->init = 1;
+	}
+	pthread_mutex_unlock(&initlock);
+}
+
+void
+rsleep(Rendez *r)
+{
+	if(r->init == 0)
+		rinit(r);
+	pthread_cond_wait(&r->c, &r->l->m);
+}
+
+int
+rwakeup(Rendez *r)
+{
+	if(r->init == 0)
+		rinit(r);
+	pthread_cond_signal(&r->c);
+
+	return 0;
+}