cancellation point test by Alexander Monakov

diff --git a/src/functional/pthread_cancel-points.c b/src/functional/pthread_cancel-points.c
new file mode 100644 (file)
index 0000000..2c12ed6
--- /dev/null
+++ b/src/functional/pthread_cancel-points.c
@@ -0,0 +1,147 @@
+// testing cancellation points
+#include <errno.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <string.h>
+#include <sys/mman.h>
+#include "test.h"
+
+#define TESTC(c, m) ( (c) || (t_error(#c " failed (%s, " m ")\n", cdescr), 0) )
+#define TESTR(f, m) do {int r; \
+       if ((r = (f))) t_error(#f " failed: %s (%s, " m ")\n", strerror(r), cdescr); } while (0)
+#define TESTE(f, m) do { \
+       if ((f)==-1) t_error(#f " failed: %s (%s, " m ")\n", strerror(errno), cdescr); } while (0)
+
+static sem_t sem_seq, sem_test;
+
+static int seqno;
+
+static const char *cdescr = "global initialization";
+
+static void prepare_sem(void *arg)
+{
+       TESTR(sem_init(&sem_test, 0, (long)arg), "creating semaphore");
+}
+
+static void cleanup_sem(void *arg)
+{
+       TESTR(sem_post(&sem_test), "posting semaphore");
+       TESTR(sem_destroy(&sem_test), "destroying semaphore");
+}
+
+static void execute_sem_wait(void *arg)
+{
+       TESTR(sem_wait(&sem_test), "waiting on semaphore in the canceled thread");
+}
+
+static void execute_sem_timedwait(void *arg)
+{
+       struct timespec ts;
+       clock_gettime(CLOCK_REALTIME, &ts);
+       ts.tv_sec += 1;
+       TESTR(sem_timedwait(&sem_test, &ts), "timed-waiting on semaphore in the canceled thread");
+}
+
+static pthread_t td_test;
+
+static void *run_test(void *arg)
+{
+       while (sem_wait(&sem_test));
+       return 0;
+}
+
+static void prepare_thread(void *arg)
+{
+       prepare_sem(arg);
+       TESTR(pthread_create(&td_test, 0, run_test, 0), "creating auxiliary thread");
+}
+
+static void cleanup_thread(void *arg)
+{
+       void *res;
+       cleanup_sem(arg);
+       if (!td_test)
+               return;
+       TESTR(pthread_join(td_test, &res), "joining auxiliary thread");
+       TESTC(res == 0, "auxiliary thread exit status");
+}
+
+static void execute_thread_join(void *arg)
+{
+       TESTR(pthread_join(td_test, 0), "joining in the canceled thread");
+       td_test = 0;
+}
+
+static void prepare_dummy(void *arg)
+{
+}
+
+static void execute_shm_open(void *arg)
+{
+       int *fd = arg;
+       TESTE(*fd = shm_open("/testshm", O_RDWR|O_CREAT, 0666), "");
+}
+
+static void cleanup_shm(void *arg)
+{
+       int *fd = arg;
+       TESTE(close(*fd), "shm fd");
+       TESTE(shm_unlink("/testshm"), "");
+}
+
+static struct {
+       int want_cancel;
+       void (*prepare)(void *);
+       void (*execute)(void *);
+       void (*cleanup)(void *);
+       void *arg;
+       const char *descr;
+} scenarios[] = {
+       {1, prepare_sem, execute_sem_wait, cleanup_sem, 0, "blocking sem_wait"},
+       {1, prepare_sem, execute_sem_wait, cleanup_sem, (void*)1, "non-blocking sem_wait"},
+       {1, prepare_sem, execute_sem_timedwait, cleanup_sem, 0, "blocking sem_timedwait"},
+       {1, prepare_sem, execute_sem_timedwait, cleanup_sem, (void*)1, "non-blocking sem_timedwait"},
+       {1, prepare_thread, execute_thread_join, cleanup_thread, 0, "blocking pthread_join"},
+       {1, prepare_thread, execute_thread_join, cleanup_thread, (void*)1, "non-blocking pthread_join"},
+       {0, prepare_dummy, execute_shm_open, cleanup_shm, &(int){0}, "shm_open"},
+       { 0 }
+}, *cur_sc = scenarios;
+
+static void *run_execute(void *arg)
+{
+       pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, 0);
+       while (sem_wait(&sem_seq));
+       pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, 0);
+       seqno = 1;
+       cur_sc->execute(cur_sc->arg);
+       seqno = 2;
+       return 0;
+}
+
+int main(void)
+{
+       TESTR(sem_init(&sem_seq, 0, 0), "creating semaphore");
+
+       for (; cur_sc->prepare; cur_sc++) {
+               pthread_t td;
+               void *res;
+
+               cdescr = cur_sc->descr;
+               cur_sc->prepare(cur_sc->arg);
+               seqno = 0;
+               TESTR(pthread_create(&td, 0, run_execute, 0), "creating thread to be canceled");
+               TESTR(pthread_cancel(td), "canceling");
+               TESTR(sem_post(&sem_seq), "unblocking canceled thread");
+               TESTR(pthread_join(td, &res), "joining canceled thread");
+               if (cur_sc->want_cancel) {
+                       TESTC(res == PTHREAD_CANCELED, "canceled thread exit status")
+                       && TESTC(seqno == 1, "seqno");
+               } else {
+                       TESTC(res != PTHREAD_CANCELED, "canceled thread exit status")
+                       && TESTC(seqno == 2, "seqno");
+               }
+               cur_sc->cleanup(cur_sc->arg);
+       }
+
+       return t_status;
+}