nsz Git - libc-test/blob - src/functional/pthread_cancel-points.c

   1 // testing cancellation points
   2 #include <errno.h>
   3 #include <pthread.h>
   4 #include <semaphore.h>
   5 #include <string.h>
   6 #include <sys/mman.h>
   7 #include "test.h"
   8
   9 #define TESTC(c, m) ( (c) || (t_error(#c " failed (%s, " m ")\n", cdescr), 0) )
  10 #define TESTR(f, m) do {int r; \
  11         if ((r = (f))) t_error(#f " failed: %s (%s, " m ")\n", strerror(r), cdescr); } while (0)
  12 #define TESTE(f, m) do { \
  13         if ((f)==-1) t_error(#f " failed: %s (%s, " m ")\n", strerror(errno), cdescr); } while (0)
  14
  15 static sem_t sem_seq, sem_test;
  16
  17 static int seqno;
  18
  19 static const char *cdescr = "global initialization";
  20
  21 static void prepare_sem(void *arg)
  22 {
  23         TESTR(sem_init(&sem_test, 0, (long)arg), "creating semaphore");
  24 }
  25
  26 static void cleanup_sem(void *arg)
  27 {
  28         TESTR(sem_destroy(&sem_test), "destroying semaphore");
  29 }
  30
  31 static void execute_sem_wait(void *arg)
  32 {
  33         TESTR(sem_wait(&sem_test), "waiting on semaphore in the canceled thread");
  34 }
  35
  36 static void execute_sem_timedwait(void *arg)
  37 {
  38         struct timespec ts;
  39         clock_gettime(CLOCK_REALTIME, &ts);
  40         ts.tv_sec += 1;
  41         TESTR(sem_timedwait(&sem_test, &ts), "timed-waiting on semaphore in the canceled thread");
  42 }
  43
  44 static pthread_t td_test;
  45
  46 static void *run_test(void *arg)
  47 {
  48         while (sem_wait(&sem_test));
  49         return 0;
  50 }
  51
  52 static void prepare_thread(void *arg)
  53 {
  54         prepare_sem(arg);
  55         TESTR(pthread_create(&td_test, 0, run_test, 0), "creating auxiliary thread");
  56 }
  57
  58 static void cleanup_thread(void *arg)
  59 {
  60         void *res;
  61         if (td_test) {
  62                 TESTR(sem_post(&sem_test), "posting semaphore");
  63                 TESTR(pthread_join(td_test, &res), "joining auxiliary thread");
  64                 TESTC(res == 0, "auxiliary thread exit status");
  65         }
  66         cleanup_sem(arg);
  67 }
  68
  69 static void execute_thread_join(void *arg)
  70 {
  71         TESTR(pthread_join(td_test, 0), "joining in the canceled thread");
  72         td_test = 0;
  73 }
  74
  75 static void prepare_dummy(void *arg)
  76 {
  77 }
  78
  79 static void execute_shm_open(void *arg)
  80 {
  81         int *fd = arg;
  82         TESTE(*fd = shm_open("/testshm", O_RDWR|O_CREAT, 0666), "");
  83 }
  84
  85 static void cleanup_shm(void *arg)
  86 {
  87         int *fd = arg;
  88         if (*fd != -1)
  89                 TESTE(close(*fd), "shm fd");
  90         TESTE(shm_unlink("/testshm"), "");
  91 }
  92
  93 static struct {
  94         int want_cancel;
  95         void (*prepare)(void *);
  96         void (*execute)(void *);
  97         void (*cleanup)(void *);
  98         void *arg;
  99         const char *descr;
 100 } scenarios[] = {
 101         {1, prepare_sem, execute_sem_wait, cleanup_sem, 0, "blocking sem_wait"},
 102         {1, prepare_sem, execute_sem_wait, cleanup_sem, (void*)1, "non-blocking sem_wait"},
 103         {1, prepare_sem, execute_sem_timedwait, cleanup_sem, 0, "blocking sem_timedwait"},
 104         {1, prepare_sem, execute_sem_timedwait, cleanup_sem, (void*)1, "non-blocking sem_timedwait"},
 105         {1, prepare_thread, execute_thread_join, cleanup_thread, 0, "blocking pthread_join"},
 106         {1, prepare_thread, execute_thread_join, cleanup_thread, (void*)1, "non-blocking pthread_join"},
 107         {0, prepare_dummy, execute_shm_open, cleanup_shm, &(int){0}, "shm_open"},
 108         { 0 }
 109 }, *cur_sc = scenarios;
 110
 111 static void *run_execute(void *arg)
 112 {
 113         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, 0);
 114         while (sem_wait(&sem_seq));
 115         pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, 0);
 116         seqno = 1;
 117         cur_sc->execute(cur_sc->arg);
 118         seqno = 2;
 119         return 0;
 120 }
 121
 122 int main(void)
 123 {
 124         TESTR(sem_init(&sem_seq, 0, 0), "creating semaphore");
 125
 126         for (; cur_sc->prepare; cur_sc++) {
 127                 pthread_t td;
 128                 void *res;
 129
 130                 cdescr = cur_sc->descr;
 131                 cur_sc->prepare(cur_sc->arg);
 132                 seqno = 0;
 133                 TESTR(pthread_create(&td, 0, run_execute, 0), "creating thread to be canceled");
 134                 TESTR(pthread_cancel(td), "canceling");
 135                 TESTR(sem_post(&sem_seq), "unblocking canceled thread");
 136                 TESTR(pthread_join(td, &res), "joining canceled thread");
 137                 if (cur_sc->want_cancel) {
 138                         TESTC(res == PTHREAD_CANCELED, "canceled thread exit status")
 139                         && TESTC(seqno == 1, "seqno");
 140                 } else {
 141                         TESTC(res != PTHREAD_CANCELED, "canceled thread exit status")
 142                         && TESTC(seqno == 2, "seqno");
 143                 }
 144                 cur_sc->cleanup(cur_sc->arg);
 145         }
 146
 147         return t_status;
 148 }