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 /*
  21  * Do _not_ define _LGPL_SOURCE because we don't want to create a
  22  * circular dependency loop between this malloc wrapper, liburcu and
  23  * libc.
  24  */
  25 #include <lttng/ust-dlfcn.h>
  26 #include <urcu/tls-compat.h>
  27 #include <helper.h>
  28 #include <pthread.h>
  29
  30 #define TRACEPOINT_DEFINE
  31 #define TRACEPOINT_CREATE_PROBES
  32 #define TP_IP_PARAM ip
  33 #include "ust_pthread.h"
  34
  35 static DEFINE_URCU_TLS_IE(int, thread_in_trace);
  36
  37 int pthread_mutex_lock(pthread_mutex_t *mutex)
  38 {
  39         static int (*mutex_lock)(pthread_mutex_t *);
  40         int retval;
  41
  42         if (!mutex_lock) {
  43                 mutex_lock = dlsym(RTLD_NEXT, "pthread_mutex_lock");
  44                 if (!mutex_lock) {
  45                         if (thread_in_trace) {
  46                                 abort();
  47                         }
  48                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
  49                         return EINVAL;
  50                 }
  51         }
  52         if (thread_in_trace) {
  53                 return mutex_lock(mutex);
  54         }
  55
  56         thread_in_trace = 1;
  57         tracepoint(lttng_ust_pthread, pthread_mutex_lock_req, mutex,
  58                 LTTNG_UST_CALLER_IP());
  59         retval = mutex_lock(mutex);
  60         tracepoint(lttng_ust_pthread, pthread_mutex_lock_acq, mutex,
  61                 retval, LTTNG_UST_CALLER_IP());
  62         thread_in_trace = 0;
  63         return retval;
  64 }
  65
  66 int pthread_mutex_trylock(pthread_mutex_t *mutex)
  67 {
  68         static int (*mutex_trylock)(pthread_mutex_t *);
  69         int retval;
  70
  71         if (!mutex_trylock) {
  72                 mutex_trylock = dlsym(RTLD_NEXT, "pthread_mutex_trylock");
  73                 if (!mutex_trylock) {
  74                         if (thread_in_trace) {
  75                                 abort();
  76                         }
  77                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
  78                         return EINVAL;
  79                 }
  80         }
  81         if (thread_in_trace) {
  82                 return mutex_trylock(mutex);
  83         }
  84
  85         thread_in_trace = 1;
  86         retval = mutex_trylock(mutex);
  87         tracepoint(lttng_ust_pthread, pthread_mutex_trylock, mutex,
  88                 retval, LTTNG_UST_CALLER_IP());
  89         thread_in_trace = 0;
  90         return retval;
  91 }
  92
  93 int pthread_mutex_unlock(pthread_mutex_t *mutex)
  94 {
  95         static int (*mutex_unlock)(pthread_mutex_t *);
  96         int retval;
  97
  98         if (!mutex_unlock) {
  99                 mutex_unlock = dlsym(RTLD_NEXT, "pthread_mutex_unlock");
 100                 if (!mutex_unlock) {
 101                         if (thread_in_trace) {
 102                                 abort();
 103                         }
 104                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
 105                         return EINVAL;
 106                 }
 107         }
 108         if (thread_in_trace) {
 109                 return mutex_unlock(mutex);
 110         }
 111
 112         thread_in_trace = 1;
 113         retval = mutex_unlock(mutex);
 114         tracepoint(lttng_ust_pthread, pthread_mutex_unlock, mutex,
 115                 retval, LTTNG_UST_CALLER_IP());
 116         thread_in_trace = 0;
 117         return retval;
 118 }