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annotate nspr/pr/include/prthread.h @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #ifndef prthread_h___
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7 #define prthread_h___
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8
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9 /*
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10 ** API for NSPR threads. On some architectures (Mac OS Classic
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11 ** notably) pre-emptibility is not guaranteed. Hard priority scheduling
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12 ** is not guaranteed, so programming using priority based synchronization
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13 ** is a no-no.
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14 **
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15 ** NSPR threads are scheduled based loosely on their client set priority.
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16 ** In general, a thread of a higher priority has a statistically better
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17 ** chance of running relative to threads of lower priority. However,
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18 ** NSPR uses multiple strategies to provide execution vehicles for thread
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19 ** abstraction of various host platforms. As it turns out, there is little
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20 ** NSPR can do to affect the scheduling attributes of "GLOBAL" threads.
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21 ** However, a semblance of GLOBAL threads is used to implement "LOCAL"
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22 ** threads. An arbitrary number of such LOCAL threads can be assigned to
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23 ** a single GLOBAL thread.
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24 **
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25 ** For scheduling, NSPR will attempt to run the highest priority LOCAL
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26 ** thread associated with a given GLOBAL thread. It is further assumed
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27 ** that the host OS will apply some form of "fair" scheduling on the
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28 ** GLOBAL threads.
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29 **
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30 ** Threads have a "system flag" which when set indicates the thread
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31 ** doesn't count for determining when the process should exit (the
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32 ** process exits when the last user thread exits).
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33 **
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34 ** Threads also have a "scope flag" which controls whether the threads
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35 ** are scheduled in the local scope or scheduled by the OS globally. This
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36 ** indicates whether a thread is permanently bound to a native OS thread.
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37 ** An unbound thread competes for scheduling resources in the same process.
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38 **
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39 ** Another flag is "state flag" which control whether the thread is joinable.
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40 ** It allows other threads to wait for the created thread to reach completion.
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41 **
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42 ** Threads can have "per-thread-data" attached to them. Each thread has a
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43 ** per-thread error number and error string which are updated when NSPR
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44 ** operations fail.
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45 */
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46 #include "prtypes.h"
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47 #include "prinrval.h"
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48
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49 PR_BEGIN_EXTERN_C
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50
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51 typedef struct PRThread PRThread;
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52 typedef struct PRThreadStack PRThreadStack;
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53
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54 typedef enum PRThreadType {
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55 PR_USER_THREAD,
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56 PR_SYSTEM_THREAD
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57 } PRThreadType;
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58
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59 typedef enum PRThreadScope {
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60 PR_LOCAL_THREAD,
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61 PR_GLOBAL_THREAD,
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62 PR_GLOBAL_BOUND_THREAD
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63 } PRThreadScope;
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64
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65 typedef enum PRThreadState {
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66 PR_JOINABLE_THREAD,
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67 PR_UNJOINABLE_THREAD
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68 } PRThreadState;
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69
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70 typedef enum PRThreadPriority
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71 {
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72 PR_PRIORITY_FIRST = 0, /* just a placeholder */
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73 PR_PRIORITY_LOW = 0, /* the lowest possible priority */
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74 PR_PRIORITY_NORMAL = 1, /* most common expected priority */
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75 PR_PRIORITY_HIGH = 2, /* slightly more aggressive scheduling */
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76 PR_PRIORITY_URGENT = 3, /* it does little good to have more than one */
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77 PR_PRIORITY_LAST = 3 /* this is just a placeholder */
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78 } PRThreadPriority;
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79
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80 /*
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81 ** Create a new thread:
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82 ** "type" is the type of thread to create
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83 ** "start(arg)" will be invoked as the threads "main"
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84 ** "priority" will be created thread's priority
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85 ** "scope" will specify whether the thread is local or global
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86 ** "state" will specify whether the thread is joinable or not
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87 ** "stackSize" the size of the stack, in bytes. The value can be zero
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88 ** and then a machine specific stack size will be chosen.
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89 **
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90 ** This can return NULL if some kind of error occurs, such as if memory is
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91 ** tight.
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92 **
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93 ** If you want the thread to start up waiting for the creator to do
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94 ** something, enter a lock before creating the thread and then have the
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95 ** threads start routine enter and exit the same lock. When you are ready
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96 ** for the thread to run, exit the lock.
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97 **
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98 ** If you want to detect the completion of the created thread, the thread
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99 ** should be created joinable. Then, use PR_JoinThread to synchrnoize the
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100 ** termination of another thread.
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101 **
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102 ** When the start function returns the thread exits. If it is the last
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103 ** PR_USER_THREAD to exit then the process exits.
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104 */
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105 NSPR_API(PRThread*) PR_CreateThread(PRThreadType type,
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106 void (PR_CALLBACK *start)(void *arg),
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107 void *arg,
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108 PRThreadPriority priority,
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109 PRThreadScope scope,
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110 PRThreadState state,
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111 PRUint32 stackSize);
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112
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113 /*
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114 ** Wait for thread termination:
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115 ** "thread" is the target thread
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116 **
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117 ** This can return PR_FAILURE if no joinable thread could be found
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118 ** corresponding to the specified target thread.
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119 **
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120 ** The calling thread is blocked until the target thread completes.
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121 ** Several threads cannot wait for the same thread to complete; one thread
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122 ** will operate successfully and others will terminate with an error PR_FAILURE.
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123 ** The calling thread will not be blocked if the target thread has already
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124 ** terminated.
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125 */
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126 NSPR_API(PRStatus) PR_JoinThread(PRThread *thread);
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127
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128 /*
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129 ** Return the current thread object for the currently running code.
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130 ** Never returns NULL.
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131 */
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132 NSPR_API(PRThread*) PR_GetCurrentThread(void);
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133 #ifndef NO_NSPR_10_SUPPORT
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134 #define PR_CurrentThread() PR_GetCurrentThread() /* for nspr1.0 compat. */
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135 #endif /* NO_NSPR_10_SUPPORT */
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136
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137 /*
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138 ** Get the priority of "thread".
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139 */
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140 NSPR_API(PRThreadPriority) PR_GetThreadPriority(const PRThread *thread);
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141
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142 /*
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143 ** Change the priority of the "thread" to "priority".
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144 **
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145 ** PR_SetThreadPriority works in a best-effort manner. On some platforms a
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146 ** special privilege, such as root access, is required to change thread
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147 ** priorities, especially to raise thread priorities. If the caller doesn't
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148 ** have enough privileges to change thread priorites, the function has no
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149 ** effect except causing a future PR_GetThreadPriority call to return
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150 ** |priority|.
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151 */
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152 NSPR_API(void) PR_SetThreadPriority(PRThread *thread, PRThreadPriority priority);
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153
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154 /*
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155 ** Set the name of the current thread, which will be visible in a debugger
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156 ** and accessible via a call to PR_GetThreadName().
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157 */
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158 NSPR_API(PRStatus) PR_SetCurrentThreadName(const char *name);
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159
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160 /*
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161 ** Return the name of "thread", if set. Otherwise return NULL.
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162 */
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163 NSPR_API(const char *) PR_GetThreadName(const PRThread *thread);
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164
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165 /*
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166 ** This routine returns a new index for per-thread-private data table.
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167 ** The index is visible to all threads within a process. This index can
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168 ** be used with the PR_SetThreadPrivate() and PR_GetThreadPrivate() routines
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169 ** to save and retrieve data associated with the index for a thread.
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170 **
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171 ** Each index is associationed with a destructor function ('dtor'). The function
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172 ** may be specified as NULL when the index is created. If it is not NULL, the
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173 ** function will be called when:
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174 ** - the thread exits and the private data for the associated index
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175 ** is not NULL,
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176 ** - new thread private data is set and the current private data is
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177 ** not NULL.
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178 **
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179 ** The index independently maintains specific values for each binding thread.
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180 ** A thread can only get access to its own thread-specific-data.
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181 **
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182 ** Upon a new index return the value associated with the index for all threads
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183 ** is NULL, and upon thread creation the value associated with all indices for
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184 ** that thread is NULL.
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185 **
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186 ** Returns PR_FAILURE if the total number of indices will exceed the maximun
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187 ** allowed.
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188 */
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189 typedef void (PR_CALLBACK *PRThreadPrivateDTOR)(void *priv);
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190
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191 NSPR_API(PRStatus) PR_NewThreadPrivateIndex(
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192 PRUintn *newIndex, PRThreadPrivateDTOR destructor);
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193
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194 /*
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195 ** Define some per-thread-private data.
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196 ** "tpdIndex" is an index into the per-thread private data table
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197 ** "priv" is the per-thread-private data
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198 **
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199 ** If the per-thread private data table has a previously registered
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200 ** destructor function and a non-NULL per-thread-private data value,
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201 ** the destructor function is invoked.
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202 **
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203 ** This can return PR_FAILURE if the index is invalid.
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204 */
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205 NSPR_API(PRStatus) PR_SetThreadPrivate(PRUintn tpdIndex, void *priv);
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206
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207 /*
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208 ** Recover the per-thread-private data for the current thread. "tpdIndex" is
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209 ** the index into the per-thread private data table.
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210 **
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211 ** The returned value may be NULL which is indistinguishable from an error
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212 ** condition.
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213 **
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214 ** A thread can only get access to its own thread-specific-data.
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215 */
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216 NSPR_API(void*) PR_GetThreadPrivate(PRUintn tpdIndex);
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217
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218 /*
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219 ** This routine sets the interrupt request for a target thread. The interrupt
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220 ** request remains in the thread's state until it is delivered exactly once
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221 ** or explicitly canceled.
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222 **
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223 ** A thread that has been interrupted will fail all NSPR blocking operations
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224 ** that return a PRStatus (I/O, waiting on a condition, etc).
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225 **
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226 ** PR_Interrupt may itself fail if the target thread is invalid.
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227 */
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228 NSPR_API(PRStatus) PR_Interrupt(PRThread *thread);
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229
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230 /*
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231 ** Clear the interrupt request for the calling thread. If no such request
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232 ** is pending, this operation is a noop.
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233 */
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234 NSPR_API(void) PR_ClearInterrupt(void);
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235
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236 /*
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237 ** Block the interrupt for the calling thread.
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238 */
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239 NSPR_API(void) PR_BlockInterrupt(void);
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240
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241 /*
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242 ** Unblock the interrupt for the calling thread.
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243 */
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244 NSPR_API(void) PR_UnblockInterrupt(void);
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245
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246 /*
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247 ** Make the current thread sleep until "ticks" time amount of time
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248 ** has expired. If "ticks" is PR_INTERVAL_NO_WAIT then the call is
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249 ** equivalent to calling PR_Yield. Calling PR_Sleep with an argument
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250 ** equivalent to PR_INTERVAL_NO_TIMEOUT is an error and will result
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251 ** in a PR_FAILURE error return.
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252 */
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253 NSPR_API(PRStatus) PR_Sleep(PRIntervalTime ticks);
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254
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255 /*
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256 ** Get the scoping of this thread.
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257 */
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258 NSPR_API(PRThreadScope) PR_GetThreadScope(const PRThread *thread);
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259
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260 /*
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261 ** Get the type of this thread.
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262 */
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263 NSPR_API(PRThreadType) PR_GetThreadType(const PRThread *thread);
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264
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265 /*
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266 ** Get the join state of this thread.
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267 */
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268 NSPR_API(PRThreadState) PR_GetThreadState(const PRThread *thread);
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269
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270 PR_END_EXTERN_C
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271
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272 #endif /* prthread_h___ */
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