none

Author: codeduckerxyx

ch14/deadlock.cpp

@@ -0,0 +1,42 @@
+#include <pthread.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int a = 0;
+int b = 0;
+pthread_mutex_t mutex_a;
+pthread_mutex_t mutex_b;
+
+void* another( void* arg ){
+    pthread_mutex_lock( &mutex_b );
+    printf("in child thread, got mutex b, waiting for mutex a\n");
+    sleep( 5 );
+    ++b;
+    pthread_mutex_lock( &mutex_a );
+    b += a++;
+    pthread_mutex_unlock( &mutex_a );
+    pthread_mutex_unlock( &mutex_b );
+    pthread_exit( NULL );
+}
+
+int main(){
+    pthread_t id;
+
+    pthread_mutex_init( &mutex_a, NULL );
+    pthread_mutex_init( &mutex_b, NULL );
+    pthread_create( &id, NULL, another, NULL );
+
+    pthread_mutex_lock( &mutex_a );
+    printf("in parent thread, got mutex a, waiting for mutex b\n");
+    sleep(5);
+    ++a;
+    pthread_mutex_lock( &mutex_b );
+    a += b++;
+    pthread_mutex_unlock( &mutex_b );
+    pthread_mutex_unlock( &mutex_a );
+
+    pthread_join( id, NULL );
+    pthread_mutex_destroy( &mutex_a );
+    pthread_mutex_destroy( &mutex_b );
+    return 0;
+}