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glibc  2.9
Defines | Functions | Variables
tst-signal6.c File Reference
#include <pthread.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "../test-skeleton.c"

Go to the source code of this file.

Defines

#define N   2
#define TEST_FUNCTION   do_test ()

Functions

static void handler (int sig)
static void * tf (void *arg)
static int do_test (void)

Variables

static pthread_barrier_t bar
struct {
void * p
pthread_t s
ti [N]
static int sig1

Define Documentation

#define N   2

Definition at line 28 of file tst-signal6.c.

#define TEST_FUNCTION   do_test ()

Definition at line 191 of file tst-signal6.c.


Function Documentation

static int do_test ( void  ) [static]

Definition at line 119 of file tst-signal6.c.

{
  sig1 = SIGRTMIN;
  if (sig1 + N > SIGRTMAX)
    {
      puts ("too few RT signals");
      return 0;
    }

  struct sigaction sa;
  sa.sa_handler = handler;
  sa.sa_flags = 0;
  sigemptyset (&sa.sa_mask);

  if (sigaction (sig1, &sa, NULL) != 0
      || sigaction (sig1 + 1, &sa, NULL) != 0
      || sigaction (sig1 + 2, &sa, NULL) != 0)
    {
      puts ("sigaction failed");
      return 1;
    }

  if (pthread_barrier_init (&bar, NULL, 1 + N) != 0)
    {
      puts ("barrier_init failed");
      return 1;
    }

  pthread_t th[N];
  size_t i;
  for (i = 0; i < N; ++i)
    if (pthread_create (&th[i], NULL, tf, (void *) (long int) i) != 0)
      {
       puts ("create failed");
       return 1;
      }

  /* Block the three signals.  */
  sigset_t ss;
  sigemptyset (&ss);
  for (i = 0; i <= N; ++i)
    sigaddset (&ss, sig1 + i);
  if (pthread_sigmask (SIG_BLOCK, &ss, NULL) != 0)
    {
      puts ("main: sigmask failed");
      return 1;
    }

  pthread_barrier_wait (&bar);

  /* Send some signals.  */
  pid_t me = getpid ();
  kill (me, sig1 + N);
  for (i = 0; i < N; ++i)
    kill (me, sig1 + i);
  kill (me, sig1 + N);

  /* Give the signals a chance to be worked on.  */
  sleep (1);

  pthread_barrier_wait (&bar);

  for (i = 0; i < N; ++i)
    if (pthread_join (th[i], NULL) != 0)
      {
       puts ("join failed");
       return 1;
      }

  return 0;
}

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static void handler ( int  sig) [static]

Definition at line 39 of file tst-signal6.c.

{
  pthread_t self = pthread_self ();
  size_t i;

  for (i = 0; i < N; ++i)
    if (ti[i].s == self)
      {
       if ((uintptr_t) ti[i].p <= (uintptr_t) &self
           && (uintptr_t) ti[i].p + 2 * MINSIGSTKSZ > (uintptr_t) &self)
         {
           puts ("alt stack not used");
           exit (1);
         }

       printf ("thread %zu used alt stack for signal %d\n", i, sig);

       return;
      }

  puts ("handler: thread not found");
  exit (1);
}

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static void* tf ( void *  arg) [static]

Definition at line 65 of file tst-signal6.c.

{
  size_t nr = (uintptr_t) arg;
  if (nr >= N)
    {
      puts ("wrong nr parameter");
      exit (1);
    }

  sigset_t ss;
  sigemptyset (&ss);
  size_t i;
  for (i = 0; i < N; ++i)
    if (i != nr)
      if (sigaddset (&ss, sig1 + i) != 0)
       {
         puts ("tf: sigaddset failed");
         exit (1);
       }
  if (pthread_sigmask (SIG_BLOCK, &ss, NULL) != 0)
    {
      puts ("tf: sigmask failed");
      exit (1);
    }

  void *p = malloc (2 * MINSIGSTKSZ);
  if (p == NULL)
    {
      puts ("tf: malloc failed");
      exit (1);
    }

  stack_t s;
  s.ss_sp = p;
  s.ss_size = 2 * MINSIGSTKSZ;
  s.ss_flags = 0;
  if (sigaltstack (&s, NULL) != 0)
    {
      puts ("tf: sigaltstack failed");
      exit (1);
    }

  ti[nr].p = p;
  ti[nr].s = pthread_self ();

  pthread_barrier_wait (&bar);

  pthread_barrier_wait (&bar);

  return NULL;
}

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Variable Documentation

pthread_barrier_t bar [static]

Definition at line 29 of file tst-signal6.c.

int sig1 [static]

Definition at line 35 of file tst-signal6.c.

struct { ... } ti[N] [static]