tausen · December 11, 2012 20:30 · Dec 11, 2012
diff --git a/gistfile1.c b/gistfile1.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <semaphore.h>
+
+sem_t semaphore;
+
+void threadfunc() {
+    while (1) {
+        sem_wait(&semaphore);
+        printf("Hello from da thread!\n");
+        sem_post(&semaphore);
+        sleep(1);
+    }
+}
+
+int main(void) {
+
+    // initialize semaphore, only to be used with threads in this process, set value to 1
+    sem_init(&semaphore, 0, 1);
+
+    pthread_t *mythread;
+
+    mythread = (pthread_t *)malloc(sizeof(*mythread));
+
+    // start the thread
+    printf("Starting thread, semaphore is unlocked.\n");
+    pthread_create(mythread, NULL, (void*)threadfunc, NULL);
+
+    getchar();
+
+    sem_wait(&semaphore);
+    printf("Semaphore locked.\n");
+
+    // do stuff with whatever is shared between threads
+    getchar();
+
+    printf("Semaphore unlocked.\n");
+    sem_post(&semaphore);
+
+    getchar();
+
+    return 0;
+}
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