src/common/compat/pthread.hpp

   1 /*
   2  * Copyright (C) 2020 Michael Jeanson <mjeanson@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 #ifndef _COMPAT_PTHREAD_H
   9 #define _COMPAT_PTHREAD_H
  10
  11 #include <common/compat/errno.hpp>
  12
  13 #include <pthread.h>
  14 #include <string.h>
  15
  16 #ifdef __FreeBSD__
  17 #include <pthread_np.h>
  18 #endif
  19
  20 #define LTTNG_PTHREAD_NAMELEN 16
  21
  22 #if defined(HAVE_PTHREAD_SETNAME_NP_WITH_TID)
  23 static inline int lttng_pthread_setname_np(const char *name)
  24 {
  25         /*
  26          * Some implementations don't error out, replicate this behavior for
  27          * consistency.
  28          */
  29         if (strnlen(name, LTTNG_PTHREAD_NAMELEN) >= LTTNG_PTHREAD_NAMELEN) {
  30                 return ERANGE;
  31         }
  32
  33         return pthread_setname_np(pthread_self(), name);
  34 }
  35 #elif defined(HAVE_PTHREAD_SETNAME_NP_WITHOUT_TID)
  36 static inline int lttng_pthread_setname_np(const char *name)
  37 {
  38         return pthread_setname_np(name);
  39 }
  40 #elif defined(HAVE_PTHREAD_SET_NAME_NP_WITH_TID)
  41
  42 static inline int lttng_pthread_setname_np(const char *name)
  43 {
  44         /* Replicate pthread_setname_np's behavior. */
  45         if (strnlen(name, LTTNG_PTHREAD_NAMELEN) >= LTTNG_PTHREAD_NAMELEN) {
  46                 return ERANGE;
  47         }
  48
  49         pthread_set_name_np(pthread_self(), name);
  50         return 0;
  51 }
  52 #elif defined(__linux__)
  53
  54 /* Fallback on prtctl on Linux */
  55 #include <sys/prctl.h>
  56
  57 static inline int lttng_pthread_setname_np(const char *name)
  58 {
  59         /* Replicate pthread_setname_np's behavior. */
  60         if (strnlen(name, LTTNG_PTHREAD_NAMELEN) >= LTTNG_PTHREAD_NAMELEN) {
  61                 return ERANGE;
  62         }
  63         return prctl(PR_SET_NAME, name, 0, 0, 0);
  64 }
  65 #else
  66 /*
  67  * For platforms without thread name support, do nothing.
  68  */
  69 static inline int lttng_pthread_setname_np(const char *name)
  70 {
  71         return -ENOSYS;
  72 }
  73 #endif
  74
  75 #if defined(HAVE_PTHREAD_GETNAME_NP_WITH_TID)
  76 static inline int lttng_pthread_getname_np(char *name, size_t len)
  77 {
  78         return pthread_getname_np(pthread_self(), name, len);
  79 }
  80 #elif defined(HAVE_PTHREAD_GETNAME_NP_WITHOUT_TID)
  81 static inline int lttng_pthread_getname_np(char *name, size_t len)
  82 {
  83         return pthread_getname_np(name, len);
  84 }
  85 #elif defined(HAVE_PTHREAD_GET_NAME_NP_WITH_TID)
  86 static inline int lttng_pthread_getname_np(char *name, size_t len)
  87 {
  88         pthread_get_name_np(pthread_self(), name, len);
  89         return 0;
  90 }
  91 #elif defined(__linux__)
  92
  93 /* Fallback on prtctl on Linux */
  94 #include <sys/prctl.h>
  95
  96 static inline int lttng_pthread_getname_np(char *name, size_t len)
  97 {
  98         return prctl(PR_GET_NAME, name, 0, 0, 0);
  99 }
 100 #else
 101 /*
 102  * For platforms without thread name support, do nothing.
 103  */
 104 static inline int lttng_pthread_getname_np(char *name, size_t len)
 105 {
 106         return -ENOSYS;
 107 }
 108 #endif
 109
 110 #endif /* _COMPAT_PTHREAD_H */