ed1edb152b
Fujitsu: POSTK_DEBUG_TEMP_FIX_53, POSTK_DEBUG_ARCH_DEP_44 Refs: #771, #1179, #1143 Change-Id: Ie17ece6864f0eeb0c0e550f4e369abb77980a0d0
64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
#define _GNU_SOURCE
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <pthread.h>
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#include <errno.h>
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#include <unistd.h>
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#include <signal.h>
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#include <sys/syscall.h>
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#include <sys/mman.h>
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volatile char *m;
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void *
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thr(void *arg)
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{
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int rc;
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char *mm;
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fprintf(stderr, "thread start tid=%d\n", (int)syscall(SYS_gettid));
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fflush(stderr);
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errno = 0;
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mm = mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
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-1, 0);
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fprintf(stderr, "mmap m=%p errno=%d\n", mm, errno);
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fflush(stderr);
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memset(mm, '\0', 4096);
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m = mm;
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*mm = '1';
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while (*m);
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rc = munmap(mm, 4096);
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fprintf(stderr, "munmap rc=%d, errno=%d\n", rc, errno);
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fflush(stderr);
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return NULL;
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}
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int
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main(int argc, char **argv)
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{
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pthread_t th;
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int rc;
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fprintf(stderr, "process start pid=%d\n", getpid());
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fflush(stderr);
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rc = pthread_create(&th, NULL, thr, NULL);
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if (rc) {
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fprintf(stderr, "pthread_create: %d\n", rc);
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exit(1);
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}
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fprintf(stderr, "pthread_create: %d\n", rc);
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fflush(stderr);
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while (!m);
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fprintf(stderr, "update m=%p\n", m);
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fflush(stderr);
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while (!*m);
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fprintf(stderr, "update *m=%c\n", *m);
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fflush(stderr);
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*m = '\0';
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pthread_join(th, NULL);
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fprintf(stderr, "main done\n");
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fflush(stderr);
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exit(0);
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}
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