mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-24 11:41:07 +00:00
117 lines
2.3 KiB
C
117 lines
2.3 KiB
C
/* Ack, a hack! We need to get the proper definition, or lack thereof,
|
|
for FLOATING_STACKS. But when !IS_IN_libpthread, this can get defined
|
|
incidentally by <tls.h>. So kludge around it. */
|
|
|
|
#define IS_IN_libpthread
|
|
#include <tls.h>
|
|
#undef IS_IN_libpthread
|
|
#undef USE___THREAD
|
|
|
|
#include <errno.h>
|
|
#include <error.h>
|
|
#include <pthread.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <ucontext.h>
|
|
|
|
|
|
#define N 4
|
|
|
|
#ifdef FLOATING_STACKS
|
|
static char stacks[N][8192];
|
|
static ucontext_t ctx[N][2];
|
|
static volatile int failures;
|
|
|
|
static void
|
|
fct (long int n)
|
|
{
|
|
/* Just to use the thread local descriptor. */
|
|
printf ("%ld: in %s now\n", n, __FUNCTION__);
|
|
errno = 0;
|
|
}
|
|
|
|
static void *
|
|
threadfct (void *arg)
|
|
{
|
|
int n = (int) (long int) arg;
|
|
|
|
if (getcontext (&ctx[n][1]) != 0)
|
|
{
|
|
printf ("%d: cannot get context: %m\n", n);
|
|
exit (1);
|
|
}
|
|
|
|
printf ("%d: %s: before makecontext\n", n, __FUNCTION__);
|
|
|
|
ctx[n][1].uc_stack.ss_sp = stacks[n];
|
|
ctx[n][1].uc_stack.ss_size = 8192;
|
|
ctx[n][1].uc_link = &ctx[n][0];
|
|
makecontext (&ctx[n][1], (void (*) (void)) fct, 1, (long int) n);
|
|
|
|
printf ("%d: %s: before swapcontext\n", n, __FUNCTION__);
|
|
|
|
if (swapcontext (&ctx[n][0], &ctx[n][1]) != 0)
|
|
{
|
|
++failures;
|
|
printf ("%d: %s: swapcontext failed\n", n, __FUNCTION__);
|
|
}
|
|
else
|
|
printf ("%d: back in %s\n", n, __FUNCTION__);
|
|
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef FLOATING_STACKS
|
|
static volatile int global;
|
|
#endif
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
#ifndef FLOATING_STACKS
|
|
puts ("not supported");
|
|
return 0;
|
|
#else
|
|
int n;
|
|
pthread_t th[N];
|
|
ucontext_t mctx;
|
|
|
|
puts ("making contexts");
|
|
if (getcontext (&mctx) != 0)
|
|
{
|
|
if (errno == ENOSYS)
|
|
{
|
|
puts ("context handling not supported");
|
|
exit (0);
|
|
}
|
|
|
|
printf ("%s: getcontext: %m\n", __FUNCTION__);
|
|
exit (1);
|
|
}
|
|
|
|
/* Play some tricks with this context. */
|
|
if (++global == 1)
|
|
if (setcontext (&mctx) != 0)
|
|
{
|
|
printf ("%s: setcontext: %m\n", __FUNCTION__);
|
|
exit (1);
|
|
}
|
|
if (global != 2)
|
|
{
|
|
printf ("%s: 'global' not incremented twice\n", __FUNCTION__);
|
|
exit (1);
|
|
}
|
|
|
|
for (n = 0; n < N; ++n)
|
|
if (pthread_create (&th[n], NULL, threadfct, (void *) (long int) n) != 0)
|
|
error (EXIT_FAILURE, errno, "cannot create all threads");
|
|
|
|
for (n = 0; n < N; ++n)
|
|
pthread_join (th[n], NULL);
|
|
|
|
return failures;
|
|
#endif
|
|
}
|