1 files changed, 63 insertions, 0 deletions
diff --git a/threads.c b/threads.c
new file mode 100644
index 0000000..d9230a3
--- /dev/null
+++ b/threads.c
@@ -0,0 +1,63 @@
+// C program to implement cond(), signal()
+// and wait() functions
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+
+// Declaration of thread condition variable
+pthread_cond_t cond1 = PTHREAD_COND_INITIALIZER;
+
+// declaring mutex
+pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+
+int done = 1;
+
+// Thread function
+void* foo()
+{
+
+    	sleep(2);
+    	// acquire a lock
+    	pthread_mutex_lock(&lock);
+    	if (done == 1) {
+
+        	// let's wait on condition variable cond1
+        	done = 2;
+        	printf("Waiting on condition variable cond1\n");
+        	pthread_cond_wait(&cond1, &lock);
+    	}
+    	else {
+
+        	// Let's signal condition variable cond1
+        	printf("Signaling condition variable cond1\n");
+        	pthread_cond_signal(&cond1);
+    	}
+
+    	// release lock
+	//    pthread_mutex_unlock(&lock);
+
+    	printf("Returning thread\n");
+
+    	return NULL;
+}
+
+// Driver code
+int main()
+{
+    	pthread_t tid1, tid2;
+
+    	// Create thread 1
+    	pthread_create(&tid1, NULL, foo, NULL);
+
+    	// sleep for 1 sec so that thread 1
+    	// would get a chance to run first
+    	sleep(1);
+
+    	// Create thread 2
+    	pthread_create(&tid2, NULL, foo, NULL);
+
+    	// wait for the completion of thread 2
+    	pthread_join(tid2, NULL);
+
+    	return 0;
+}