src/thread.c

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7
   8 #include "common.h"
   9
  10 #if !defined(GIT_THREADS)
  11
  12 #define TLSDATA_MAX 16
  13
  14 typedef struct {
  15         void *value;
  16         void (GIT_SYSTEM_CALL *destroy_fn)(void *);
  17 } tlsdata_value;
  18
  19 static tlsdata_value tlsdata_values[TLSDATA_MAX];
  20 static int tlsdata_cnt = 0;
  21
  22 int git_tlsdata_init(git_tlsdata_key *key, void (GIT_SYSTEM_CALL *destroy_fn)(void *))
  23 {
  24         if (tlsdata_cnt >= TLSDATA_MAX)
  25                 return -1;
  26
  27         tlsdata_values[tlsdata_cnt].value = NULL;
  28         tlsdata_values[tlsdata_cnt].destroy_fn = destroy_fn;
  29
  30         *key = tlsdata_cnt;
  31         tlsdata_cnt++;
  32
  33         return 0;
  34 }
  35
  36 int git_tlsdata_set(git_tlsdata_key key, void *value)
  37 {
  38         if (key < 0 || key > tlsdata_cnt)
  39                 return -1;
  40
  41         tlsdata_values[key].value = value;
  42         return 0;
  43 }
  44
  45 void *git_tlsdata_get(git_tlsdata_key key)
  46 {
  47         if (key < 0 || key > tlsdata_cnt)
  48                 return NULL;
  49
  50         return tlsdata_values[key].value;
  51 }
  52
  53 int git_tlsdata_dispose(git_tlsdata_key key)
  54 {
  55         void *value;
  56         void (*destroy_fn)(void *) = NULL;
  57
  58         if (key < 0 || key > tlsdata_cnt)
  59                 return -1;
  60
  61         value = tlsdata_values[key].value;
  62         destroy_fn = tlsdata_values[key].destroy_fn;
  63
  64         tlsdata_values[key].value = NULL;
  65         tlsdata_values[key].destroy_fn = NULL;
  66
  67         if (value && destroy_fn)
  68                 destroy_fn(value);
  69
  70         return 0;
  71 }
  72
  73 #elif defined(GIT_WIN32)
  74
  75 int git_tlsdata_init(git_tlsdata_key *key, void (GIT_SYSTEM_CALL *destroy_fn)(void *))
  76 {
  77         DWORD fls_index = FlsAlloc(destroy_fn);
  78
  79         if (fls_index == FLS_OUT_OF_INDEXES)
  80                 return -1;
  81
  82         *key = fls_index;
  83         return 0;
  84 }
  85
  86 int git_tlsdata_set(git_tlsdata_key key, void *value)
  87 {
  88         if (!FlsSetValue(key, value))
  89                 return -1;
  90
  91         return 0;
  92 }
  93
  94 void *git_tlsdata_get(git_tlsdata_key key)
  95 {
  96         return FlsGetValue(key);
  97 }
  98
  99 int git_tlsdata_dispose(git_tlsdata_key key)
 100 {
 101         if (!FlsFree(key))
 102                 return -1;
 103
 104         return 0;
 105 }
 106
 107 #elif defined(_POSIX_THREADS)
 108
 109 int git_tlsdata_init(git_tlsdata_key *key, void (GIT_SYSTEM_CALL *destroy_fn)(void *))
 110 {
 111         if (pthread_key_create(key, destroy_fn) != 0)
 112                 return -1;
 113
 114         return 0;
 115 }
 116
 117 int git_tlsdata_set(git_tlsdata_key key, void *value)
 118 {
 119         if (pthread_setspecific(key, value) != 0)
 120                 return -1;
 121
 122         return 0;
 123 }
 124
 125 void *git_tlsdata_get(git_tlsdata_key key)
 126 {
 127         return pthread_getspecific(key);
 128 }
 129
 130 int git_tlsdata_dispose(git_tlsdata_key key)
 131 {
 132         if (pthread_key_delete(key) != 0)
 133                 return -1;
 134
 135         return 0;
 136 }
 137
 138 #else
 139 # error unknown threading model
 140 #endif