liblttng-ust-libc-wrapper/lttng-ust-pthread.c

   1 /*
   2  * Copyright (C) 2013  Mentor Graphics
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  17  */
  18
  19 #define _GNU_SOURCE
  20 #define _LGPL_SOURCE
  21 #include <lttng/ust-dlfcn.h>
  22 #include <helper.h>
  23 #include <pthread.h>
  24
  25 #define TRACEPOINT_DEFINE
  26 #define TRACEPOINT_CREATE_PROBES
  27 #define TP_IP_PARAM ip
  28 #include "ust_pthread.h"
  29
  30 static __thread int thread_in_trace;
  31
  32 int pthread_mutex_lock(pthread_mutex_t *mutex)
  33 {
  34         static int (*mutex_lock)(pthread_mutex_t *);
  35         int retval;
  36
  37         if (!mutex_lock) {
  38                 mutex_lock = dlsym(RTLD_NEXT, "pthread_mutex_lock");
  39                 if (!mutex_lock) {
  40                         if (thread_in_trace) {
  41                                 abort();
  42                         }
  43                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
  44                         return EINVAL;
  45                 }
  46         }
  47         if (thread_in_trace) {
  48                 return mutex_lock(mutex);
  49         }
  50
  51         thread_in_trace = 1;
  52         tracepoint(lttng_ust_pthread, pthread_mutex_lock_req, mutex,
  53                 LTTNG_UST_CALLER_IP());
  54         retval = mutex_lock(mutex);
  55         tracepoint(lttng_ust_pthread, pthread_mutex_lock_acq, mutex,
  56                 retval, LTTNG_UST_CALLER_IP());
  57         thread_in_trace = 0;
  58         return retval;
  59 }
  60
  61 int pthread_mutex_trylock(pthread_mutex_t *mutex)
  62 {
  63         static int (*mutex_trylock)(pthread_mutex_t *);
  64         int retval;
  65
  66         if (!mutex_trylock) {
  67                 mutex_trylock = dlsym(RTLD_NEXT, "pthread_mutex_trylock");
  68                 if (!mutex_trylock) {
  69                         if (thread_in_trace) {
  70                                 abort();
  71                         }
  72                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
  73                         return EINVAL;
  74                 }
  75         }
  76         if (thread_in_trace) {
  77                 return mutex_trylock(mutex);
  78         }
  79
  80         thread_in_trace = 1;
  81         retval = mutex_trylock(mutex);
  82         tracepoint(lttng_ust_pthread, pthread_mutex_trylock, mutex,
  83                 retval, LTTNG_UST_CALLER_IP());
  84         thread_in_trace = 0;
  85         return retval;
  86 }
  87
  88 int pthread_mutex_unlock(pthread_mutex_t *mutex)
  89 {
  90         static int (*mutex_unlock)(pthread_mutex_t *);
  91         int retval;
  92
  93         if (!mutex_unlock) {
  94                 mutex_unlock = dlsym(RTLD_NEXT, "pthread_mutex_unlock");
  95                 if (!mutex_unlock) {
  96                         if (thread_in_trace) {
  97                                 abort();
  98                         }
  99                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
 100                         return EINVAL;
 101                 }
 102         }
 103         if (thread_in_trace) {
 104                 return mutex_unlock(mutex);
 105         }
 106
 107         thread_in_trace = 1;
 108         retval = mutex_unlock(mutex);
 109         tracepoint(lttng_ust_pthread, pthread_mutex_unlock, mutex,
 110                 retval, LTTNG_UST_CALLER_IP());
 111         thread_in_trace = 0;
 112         return retval;
 113 }