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 <helper.h>
  27 #include <pthread.h>
  28
  29 #define TRACEPOINT_DEFINE
  30 #define TRACEPOINT_CREATE_PROBES
  31 #define TP_IP_PARAM ip
  32 #include "ust_pthread.h"
  33
  34 static __thread int thread_in_trace;
  35
  36 int pthread_mutex_lock(pthread_mutex_t *mutex)
  37 {
  38         static int (*mutex_lock)(pthread_mutex_t *);
  39         int retval;
  40
  41         if (!mutex_lock) {
  42                 mutex_lock = dlsym(RTLD_NEXT, "pthread_mutex_lock");
  43                 if (!mutex_lock) {
  44                         if (thread_in_trace) {
  45                                 abort();
  46                         }
  47                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
  48                         return EINVAL;
  49                 }
  50         }
  51         if (thread_in_trace) {
  52                 return mutex_lock(mutex);
  53         }
  54
  55         thread_in_trace = 1;
  56         tracepoint(lttng_ust_pthread, pthread_mutex_lock_req, mutex,
  57                 LTTNG_UST_CALLER_IP());
  58         retval = mutex_lock(mutex);
  59         tracepoint(lttng_ust_pthread, pthread_mutex_lock_acq, mutex,
  60                 retval, LTTNG_UST_CALLER_IP());
  61         thread_in_trace = 0;
  62         return retval;
  63 }
  64
  65 int pthread_mutex_trylock(pthread_mutex_t *mutex)
  66 {
  67         static int (*mutex_trylock)(pthread_mutex_t *);
  68         int retval;
  69
  70         if (!mutex_trylock) {
  71                 mutex_trylock = dlsym(RTLD_NEXT, "pthread_mutex_trylock");
  72                 if (!mutex_trylock) {
  73                         if (thread_in_trace) {
  74                                 abort();
  75                         }
  76                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
  77                         return EINVAL;
  78                 }
  79         }
  80         if (thread_in_trace) {
  81                 return mutex_trylock(mutex);
  82         }
  83
  84         thread_in_trace = 1;
  85         retval = mutex_trylock(mutex);
  86         tracepoint(lttng_ust_pthread, pthread_mutex_trylock, mutex,
  87                 retval, LTTNG_UST_CALLER_IP());
  88         thread_in_trace = 0;
  89         return retval;
  90 }
  91
  92 int pthread_mutex_unlock(pthread_mutex_t *mutex)
  93 {
  94         static int (*mutex_unlock)(pthread_mutex_t *);
  95         int retval;
  96
  97         if (!mutex_unlock) {
  98                 mutex_unlock = dlsym(RTLD_NEXT, "pthread_mutex_unlock");
  99                 if (!mutex_unlock) {
 100                         if (thread_in_trace) {
 101                                 abort();
 102                         }
 103                         fprintf(stderr, "unable to initialize pthread wrapper library.\n");
 104                         return EINVAL;
 105                 }
 106         }
 107         if (thread_in_trace) {
 108                 return mutex_unlock(mutex);
 109         }
 110
 111         thread_in_trace = 1;
 112         retval = mutex_unlock(mutex);
 113         tracepoint(lttng_ust_pthread, pthread_mutex_unlock, mutex,
 114                 retval, LTTNG_UST_CALLER_IP());
 115         thread_in_trace = 0;
 116         return retval;
 117 }