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