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[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [gdb/] [testsuite/] [gdb.threads/] [watchthreads-reorder.c] - Rev 816
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/* This testcase is part of GDB, the GNU debugger. Copyright 2009, 2010 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #define _GNU_SOURCE #include <pthread.h> #include <stdio.h> #include <limits.h> #include <errno.h> #include <stdlib.h> #include <string.h> #include <assert.h> #include <sys/types.h> #include <signal.h> #include <unistd.h> #include <asm/unistd.h> #define gettid() syscall (__NR_gettid) /* Terminate always in the main task, it can lock up with SIGSTOPped GDB otherwise. */ #define TIMEOUT (gettid () == getpid() ? 10 : 15) static pid_t thread1_tid; static pthread_cond_t thread1_tid_cond = PTHREAD_COND_INITIALIZER; static pthread_mutex_t thread1_tid_mutex = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP; static pid_t thread2_tid; static pthread_cond_t thread2_tid_cond = PTHREAD_COND_INITIALIZER; static pthread_mutex_t thread2_tid_mutex = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP; static pthread_mutex_t terminate_mutex = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP; /* These variables must have lower in-memory addresses than thread1_rwatch and thread2_rwatch so that they take their watchpoint slots. */ static int unused1_rwatch; static int unused2_rwatch; static volatile int thread1_rwatch; static volatile int thread2_rwatch; /* Do not use alarm as it would create a ptrace event which would hang up us if we are being traced by GDB which we stopped ourselves. */ static void timed_mutex_lock (pthread_mutex_t *mutex) { int i; struct timespec start, now; i = clock_gettime (CLOCK_MONOTONIC, &start); assert (i == 0); do { i = pthread_mutex_trylock (mutex); if (i == 0) return; assert (i == EBUSY); i = clock_gettime (CLOCK_MONOTONIC, &now); assert (i == 0); assert (now.tv_sec >= start.tv_sec); } while (now.tv_sec - start.tv_sec < TIMEOUT); fprintf (stderr, "Timed out waiting for internal lock!\n"); exit (EXIT_FAILURE); } static void * thread1_func (void *unused) { int i; volatile int rwatch_store; timed_mutex_lock (&thread1_tid_mutex); /* THREAD1_TID_MUTEX must be already locked to avoid race. */ thread1_tid = gettid (); i = pthread_cond_signal (&thread1_tid_cond); assert (i == 0); i = pthread_mutex_unlock (&thread1_tid_mutex); assert (i == 0); rwatch_store = thread1_rwatch; /* Be sure the "t (tracing stop)" test can proceed for both threads. */ timed_mutex_lock (&terminate_mutex); i = pthread_mutex_unlock (&terminate_mutex); assert (i == 0); return NULL; } static void * thread2_func (void *unused) { int i; volatile int rwatch_store; timed_mutex_lock (&thread2_tid_mutex); /* THREAD2_TID_MUTEX must be already locked to avoid race. */ thread2_tid = gettid (); i = pthread_cond_signal (&thread2_tid_cond); assert (i == 0); i = pthread_mutex_unlock (&thread2_tid_mutex); assert (i == 0); rwatch_store = thread2_rwatch; /* Be sure the "t (tracing stop)" test can proceed for both threads. */ timed_mutex_lock (&terminate_mutex); i = pthread_mutex_unlock (&terminate_mutex); assert (i == 0); return NULL; } static const char * proc_string (const char *filename, const char *line) { FILE *f; static char buf[LINE_MAX]; size_t line_len = strlen (line); f = fopen (filename, "r"); if (f == NULL) { fprintf (stderr, "fopen (\"%s\") for \"%s\": %s\n", filename, line, strerror (errno)); exit (EXIT_FAILURE); } while (errno = 0, fgets (buf, sizeof (buf), f)) { char *s; s = strchr (buf, '\n'); assert (s != NULL); *s = 0; if (strncmp (buf, line, line_len) != 0) continue; if (fclose (f)) { fprintf (stderr, "fclose (\"%s\") for \"%s\": %s\n", filename, line, strerror (errno)); exit (EXIT_FAILURE); } return &buf[line_len]; } if (errno != 0) { fprintf (stderr, "fgets (\"%s\": %s\n", filename, strerror (errno)); exit (EXIT_FAILURE); } fprintf (stderr, "\"%s\": No line \"%s\" found.\n", filename, line); exit (EXIT_FAILURE); } static unsigned long proc_ulong (const char *filename, const char *line) { const char *s = proc_string (filename, line); long retval; char *end; errno = 0; retval = strtol (s, &end, 10); if (retval < 0 || retval >= LONG_MAX || (end && *end)) { fprintf (stderr, "\"%s\":\"%s\": %ld, %s\n", filename, line, retval, strerror (errno)); exit (EXIT_FAILURE); } return retval; } static void state_wait (pid_t process, const char *wanted) { char *filename; int i; struct timespec start, now; const char *state; i = asprintf (&filename, "/proc/%lu/status", (unsigned long) process); assert (i > 0); i = clock_gettime (CLOCK_MONOTONIC, &start); assert (i == 0); do { state = proc_string (filename, "State:\t"); /* torvalds/linux-2.6.git 464763cf1c6df632dccc8f2f4c7e50163154a2c0 has changed "T (tracing stop)" to "t (tracing stop)". Make the GDB testcase backward compatible with older Linux kernels. */ if (strcmp (state, "T (tracing stop)") == 0) state = "t (tracing stop)"; if (strcmp (state, wanted) == 0) { free (filename); return; } if (sched_yield ()) { perror ("sched_yield()"); exit (EXIT_FAILURE); } i = clock_gettime (CLOCK_MONOTONIC, &now); assert (i == 0); assert (now.tv_sec >= start.tv_sec); } while (now.tv_sec - start.tv_sec < TIMEOUT); fprintf (stderr, "Timed out waiting for PID %lu \"%s\" (now it is \"%s\")!\n", (unsigned long) process, wanted, state); exit (EXIT_FAILURE); } static volatile pid_t tracer = 0; static pthread_t thread1, thread2; static void cleanup (void) { printf ("Resuming GDB PID %lu.\n", (unsigned long) tracer); if (tracer) { int i; int tracer_save = tracer; tracer = 0; i = kill (tracer_save, SIGCONT); assert (i == 0); } } int main (int argc, char **argv) { int i; int standalone = 0; if (argc == 2 && strcmp (argv[1], "-s") == 0) standalone = 1; else assert (argc == 1); setbuf (stdout, NULL); timed_mutex_lock (&thread1_tid_mutex); timed_mutex_lock (&thread2_tid_mutex); timed_mutex_lock (&terminate_mutex); i = pthread_create (&thread1, NULL, thread1_func, NULL); assert (i == 0); i = pthread_create (&thread2, NULL, thread2_func, NULL); assert (i == 0); if (!standalone) { tracer = proc_ulong ("/proc/self/status", "TracerPid:\t"); if (tracer == 0) { fprintf (stderr, "The testcase must be run by GDB!\n"); exit (EXIT_FAILURE); } if (tracer != getppid ()) { fprintf (stderr, "The testcase parent must be our GDB tracer!\n"); exit (EXIT_FAILURE); } } /* SIGCONT our debugger in the case of our crash as we would deadlock otherwise. */ atexit (cleanup); printf ("Stopping GDB PID %lu.\n", (unsigned long) tracer); if (tracer) { i = kill (tracer, SIGSTOP); assert (i == 0); state_wait (tracer, "T (stopped)"); } /* Threads are now waiting at timed_mutex_lock (thread1_tid_mutex) and so they could not trigger the watchpoints before GDB gets unstopped later. Threads get resumed at pthread_cond_wait below. Use `while' loops for protection against spurious pthread_cond_wait wakeups. */ printf ("Waiting till the threads initialize their TIDs.\n"); while (thread1_tid == 0) { i = pthread_cond_wait (&thread1_tid_cond, &thread1_tid_mutex); assert (i == 0); } while (thread2_tid == 0) { i = pthread_cond_wait (&thread2_tid_cond, &thread2_tid_mutex); assert (i == 0); } printf ("Thread 1 TID = %lu, thread 2 TID = %lu, PID = %lu.\n", (unsigned long) thread1_tid, (unsigned long) thread2_tid, (unsigned long) getpid ()); printf ("Waiting till the threads get trapped by the watchpoints.\n"); if (tracer) { /* s390x-unknown-linux-gnu will fail with "R (running)". */ state_wait (thread1_tid, "t (tracing stop)"); state_wait (thread2_tid, "t (tracing stop)"); } cleanup (); printf ("Joining the threads.\n"); i = pthread_mutex_unlock (&terminate_mutex); assert (i == 0); i = pthread_join (thread1, NULL); assert (i == 0); i = pthread_join (thread2, NULL); assert (i == 0); printf ("Exiting.\n"); /* break-at-exit */ /* Just prevent compiler `warning: unusedX_rwatch defined but not used'. */ unused1_rwatch = 1; unused2_rwatch = 2; return EXIT_SUCCESS; }
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