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 #include <lttng/ust-dlfcn.h>
  21 #include <helper.h>
  22 #include <pthread.h>
  23
  24 #define TRACEPOINT_DEFINE
  25 #define TRACEPOINT_CREATE_PROBES
  26 #define TP_IP_PARAM ip
  27 #include "ust_pthread.h"
  28
  29 static __thread int thread_in_trace;
  30
  31 int pthread_mutex_lock(pthread_mutex_t *mutex)
  32 {
  33         static int (*mutex_lock)(pthread_mutex_t *);
  34         int retval;
  35
  36         if (!mutex_lock) {
  37                 mutex_lock = dlsym(RTLD_NEXT, "pthread_mutex_lock");
  38                 if (!mutex_lock) {
  39                         if (thread_in_trace) {
  40                                 abort();
  41                         }
  42                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
  43                         return EINVAL;
  44                 }
  45         }
  46         if (thread_in_trace) {
  47                 return mutex_lock(mutex);
  48         }
  49
  50         thread_in_trace = 1;
  51         tracepoint(lttng_ust_pthread, pthread_mutex_lock_req, mutex,
  52                 LTTNG_UST_CALLER_IP());
  53         retval = mutex_lock(mutex);
  54         tracepoint(lttng_ust_pthread, pthread_mutex_lock_acq, mutex,
  55                 retval, LTTNG_UST_CALLER_IP());
  56         thread_in_trace = 0;
  57         return retval;
  58 }
  59
  60 int pthread_mutex_trylock(pthread_mutex_t *mutex)
  61 {
  62         static int (*mutex_trylock)(pthread_mutex_t *);
  63         int retval;
  64
  65         if (!mutex_trylock) {
  66                 mutex_trylock = dlsym(RTLD_NEXT, "pthread_mutex_trylock");
  67                 if (!mutex_trylock) {
  68                         if (thread_in_trace) {
  69                                 abort();
  70                         }
  71                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
  72                         return EINVAL;
  73                 }
  74         }
  75         if (thread_in_trace) {
  76                 return mutex_trylock(mutex);
  77         }
  78
  79         thread_in_trace = 1;
  80         retval = mutex_trylock(mutex);
  81         tracepoint(lttng_ust_pthread, pthread_mutex_trylock, mutex,
  82                 retval, LTTNG_UST_CALLER_IP());
  83         thread_in_trace = 0;
  84         return retval;
  85 }
  86
  87 int pthread_mutex_unlock(pthread_mutex_t *mutex)
  88 {
  89         static int (*mutex_unlock)(pthread_mutex_t *);
  90         int retval;
  91
  92         if (!mutex_unlock) {
  93                 mutex_unlock = dlsym(RTLD_NEXT, "pthread_mutex_unlock");
  94                 if (!mutex_unlock) {
  95                         if (thread_in_trace) {
  96                                 abort();
  97                         }
  98                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
  99                         return EINVAL;
 100                 }
 101         }
 102         if (thread_in_trace) {
 103                 return mutex_unlock(mutex);
 104         }
 105
 106         thread_in_trace = 1;
 107         retval = mutex_unlock(mutex);
 108         tracepoint(lttng_ust_pthread, pthread_mutex_unlock, mutex,
 109                 retval, LTTNG_UST_CALLER_IP());
 110         thread_in_trace = 0;
 111         return retval;
 112 }