Protect shared affinity table with mutex

[urcu.git] / test_perthreadlock.c

diff --git a/test_perthreadlock.c b/test_perthreadlock.c
index 5bbe72b1637af9adbaa099cb4c4631a74a3fc50e..31b7721d631a2ea8e4470029da35d66d3bb89e7f 100644 (file)
--- a/test_perthreadlock.c
+++ b/test_perthreadlock.c
@@ -102,22 +102,33 @@ static unsigned int cpu_affinities[NR_CPUS];
 static unsigned int next_aff = 0;
 static int use_affinity = 0;
 
+pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
+
 static void set_affinity(void)
 {
        cpu_set_t mask;
        int cpu;
+       int ret;
 
        if (!use_affinity)
                return;
 
+       ret = pthread_mutex_lock(&affinity_mutex);
+       if (ret) {
+               perror("Error in pthread mutex lock");
+               exit(-1);
+       }
        cpu = cpu_affinities[next_aff++];
+       ret = pthread_mutex_unlock(&affinity_mutex);
+       if (ret) {
+               perror("Error in pthread mutex unlock");
+               exit(-1);
+       }
        CPU_ZERO(&mask);
        CPU_SET(cpu, &mask);
        sched_setaffinity(0, sizeof(mask), &mask);
 }
 
-
-
 /*
  * returns 0 if test should end.
  */