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annotate nspr/pr/include/md/_pth.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 nspr_pth_defs_h_
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7 #define nspr_pth_defs_h_
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8
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9 /*
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10 ** Appropriate definitions of entry points not used in a pthreads world
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11 */
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12 #define _PR_MD_BLOCK_CLOCK_INTERRUPTS()
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13 #define _PR_MD_UNBLOCK_CLOCK_INTERRUPTS()
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14 #define _PR_MD_DISABLE_CLOCK_INTERRUPTS()
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15 #define _PR_MD_ENABLE_CLOCK_INTERRUPTS()
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16
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17 /* In good standards fashion, the DCE threads (based on posix-4) are not
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18 * quite the same as newer posix implementations. These are mostly name
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19 * changes and small differences, so macros usually do the trick
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20 */
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21 #ifdef _PR_DCETHREADS
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22 #define _PT_PTHREAD_MUTEXATTR_INIT pthread_mutexattr_create
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23 #define _PT_PTHREAD_MUTEXATTR_DESTROY pthread_mutexattr_delete
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24 #define _PT_PTHREAD_MUTEX_INIT(m, a) pthread_mutex_init(&(m), a)
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25 #define _PT_PTHREAD_MUTEX_IS_LOCKED(m) (0 == pthread_mutex_trylock(&(m)))
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26 #define _PT_PTHREAD_CONDATTR_INIT pthread_condattr_create
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27 #define _PT_PTHREAD_COND_INIT(m, a) pthread_cond_init(&(m), a)
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28 #define _PT_PTHREAD_CONDATTR_DESTROY pthread_condattr_delete
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29
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30 /* Notes about differences between DCE threads and pthreads 10:
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31 * 1. pthread_mutex_trylock returns 1 when it locks the mutex
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32 * 0 when it does not. The latest pthreads has a set of errno-like
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33 * return values.
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34 * 2. return values from pthread_cond_timedwait are different.
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35 *
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36 *
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37 *
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38 */
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39 #elif defined(BSDI)
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40 /*
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41 * Mutex and condition attributes are not supported. The attr
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42 * argument to pthread_mutex_init() and pthread_cond_init() must
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43 * be passed as NULL.
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44 *
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45 * The memset calls in _PT_PTHREAD_MUTEX_INIT and _PT_PTHREAD_COND_INIT
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46 * are to work around BSDI's using a single bit to indicate a mutex
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47 * or condition variable is initialized. This entire BSDI section
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48 * will go away when BSDI releases updated threads libraries for
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49 * BSD/OS 3.1 and 4.0.
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50 */
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51 #define _PT_PTHREAD_MUTEXATTR_INIT(x) 0
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52 #define _PT_PTHREAD_MUTEXATTR_DESTROY(x) /* */
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53 #define _PT_PTHREAD_MUTEX_INIT(m, a) (memset(&(m), 0, sizeof(m)), \
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54 pthread_mutex_init(&(m), NULL))
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55 #define _PT_PTHREAD_MUTEX_IS_LOCKED(m) (EBUSY == pthread_mutex_trylock(&(m)))
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56 #define _PT_PTHREAD_CONDATTR_INIT(x) 0
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57 #define _PT_PTHREAD_CONDATTR_DESTROY(x) /* */
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58 #define _PT_PTHREAD_COND_INIT(m, a) (memset(&(m), 0, sizeof(m)), \
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59 pthread_cond_init(&(m), NULL))
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60 #else
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61 #define _PT_PTHREAD_MUTEXATTR_INIT pthread_mutexattr_init
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62 #define _PT_PTHREAD_MUTEXATTR_DESTROY pthread_mutexattr_destroy
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63 #define _PT_PTHREAD_MUTEX_INIT(m, a) pthread_mutex_init(&(m), &(a))
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64 #if defined(FREEBSD)
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65 #define _PT_PTHREAD_MUTEX_IS_LOCKED(m) pt_pthread_mutex_is_locked(&(m))
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66 #else
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67 #define _PT_PTHREAD_MUTEX_IS_LOCKED(m) (EBUSY == pthread_mutex_trylock(&(m)))
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68 #endif
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69 #if defined(ANDROID)
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70 /* Conditional attribute init and destroy aren't implemented in bionic. */
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71 #define _PT_PTHREAD_CONDATTR_INIT(x) 0
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72 #define _PT_PTHREAD_CONDATTR_DESTROY(x) /* */
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73 #else
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74 #define _PT_PTHREAD_CONDATTR_INIT pthread_condattr_init
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75 #define _PT_PTHREAD_CONDATTR_DESTROY pthread_condattr_destroy
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76 #endif
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77 #define _PT_PTHREAD_COND_INIT(m, a) pthread_cond_init(&(m), &(a))
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78 #endif
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79
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80 /* The pthreads standard does not specify an invalid value for the
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81 * pthread_t handle. (0 is usually an invalid pthread identifier
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82 * but there are exceptions, for example, DG/UX.) These macros
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83 * define a way to set the handle to or compare the handle with an
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84 * invalid identifier. These macros are not portable and may be
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85 * more of a problem as we adapt to more pthreads implementations.
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86 * They are only used in the PRMonitor functions. Do not use them
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87 * in new code.
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88 *
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89 * Unfortunately some of our clients depend on certain properties
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90 * of our PRMonitor implementation, preventing us from replacing
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91 * it by a portable implementation.
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92 * - High-performance servers like the fact that PR_EnterMonitor
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93 * only calls PR_Lock and PR_ExitMonitor only calls PR_Unlock.
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94 * (A portable implementation would use a PRLock and a PRCondVar
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95 * to implement the recursive lock in a monitor and call both
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96 * PR_Lock and PR_Unlock in PR_EnterMonitor and PR_ExitMonitor.)
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97 * Unfortunately this forces us to read the monitor owner field
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98 * without holding a lock.
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99 * - One way to make it safe to read the monitor owner field
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100 * without holding a lock is to make that field a PRThread*
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101 * (one should be able to read a pointer with a single machine
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102 * instruction). However, PR_GetCurrentThread calls calloc if
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103 * it is called by a thread that was not created by NSPR. The
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104 * malloc tracing tools in the Mozilla client use PRMonitor for
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105 * locking in their malloc, calloc, and free functions. If
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106 * PR_EnterMonitor calls any of these functions, infinite
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107 * recursion ensues.
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108 */
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109 #if defined(_PR_DCETHREADS)
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110 #define _PT_PTHREAD_INVALIDATE_THR_HANDLE(t) \
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111 memset(&(t), 0, sizeof(pthread_t))
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112 #define _PT_PTHREAD_THR_HANDLE_IS_INVALID(t) \
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113 (!memcmp(&(t), &pt_zero_tid, sizeof(pthread_t)))
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114 #define _PT_PTHREAD_COPY_THR_HANDLE(st, dt) (dt) = (st)
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115 #elif defined(IRIX) || defined(OSF1) || defined(AIX) || defined(SOLARIS) \
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116 || defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
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117 || defined(HPUX) || defined(FREEBSD) \
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118 || defined(NETBSD) || defined(OPENBSD) || defined(BSDI) \
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119 || defined(NTO) || defined(DARWIN) \
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120 || defined(UNIXWARE) || defined(RISCOS) || defined(SYMBIAN)
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121 #define _PT_PTHREAD_INVALIDATE_THR_HANDLE(t) (t) = 0
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122 #define _PT_PTHREAD_THR_HANDLE_IS_INVALID(t) (t) == 0
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123 #define _PT_PTHREAD_COPY_THR_HANDLE(st, dt) (dt) = (st)
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124 #else
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125 #error "pthreads is not supported for this architecture"
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126 #endif
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127
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128 #if defined(_PR_DCETHREADS)
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129 #define _PT_PTHREAD_ATTR_INIT pthread_attr_create
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130 #define _PT_PTHREAD_ATTR_DESTROY pthread_attr_delete
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131 #define _PT_PTHREAD_CREATE(t, a, f, r) pthread_create(t, a, f, r)
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132 #define _PT_PTHREAD_KEY_CREATE pthread_keycreate
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133 #define _PT_PTHREAD_ATTR_SETSCHEDPOLICY pthread_attr_setsched
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134 #define _PT_PTHREAD_ATTR_GETSTACKSIZE(a, s) \
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135 (*(s) = pthread_attr_getstacksize(*(a)), 0)
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136 #define _PT_PTHREAD_GETSPECIFIC(k, r) \
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137 pthread_getspecific((k), (pthread_addr_t *) &(r))
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138 #elif defined(_PR_PTHREADS)
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139 #define _PT_PTHREAD_ATTR_INIT pthread_attr_init
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140 #define _PT_PTHREAD_ATTR_DESTROY pthread_attr_destroy
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141 #define _PT_PTHREAD_CREATE(t, a, f, r) pthread_create(t, &a, f, r)
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142 #define _PT_PTHREAD_KEY_CREATE pthread_key_create
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143 #define _PT_PTHREAD_ATTR_SETSCHEDPOLICY pthread_attr_setschedpolicy
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144 #define _PT_PTHREAD_ATTR_GETSTACKSIZE(a, s) pthread_attr_getstacksize(a, s)
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145 #define _PT_PTHREAD_GETSPECIFIC(k, r) (r) = pthread_getspecific(k)
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146 #else
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147 #error "Cannot determine pthread strategy"
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148 #endif
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149
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150 #if defined(_PR_DCETHREADS)
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151 #define _PT_PTHREAD_EXPLICIT_SCHED _PT_PTHREAD_DEFAULT_SCHED
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152 #endif
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153
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154 /*
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155 * pthread_mutex_trylock returns different values in DCE threads and
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156 * pthreads.
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157 */
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158 #if defined(_PR_DCETHREADS)
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159 #define PT_TRYLOCK_SUCCESS 1
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160 #define PT_TRYLOCK_BUSY 0
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161 #else
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162 #define PT_TRYLOCK_SUCCESS 0
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163 #define PT_TRYLOCK_BUSY EBUSY
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164 #endif
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165
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166 /*
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167 * These platforms don't have sigtimedwait()
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168 */
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169 #if (defined(AIX) && !defined(AIX4_3_PLUS)) \
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170 || defined(LINUX) || defined(__GNU__)|| defined(__GLIBC__) \
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171 || defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \
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172 || defined(BSDI) || defined(UNIXWARE) \
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173 || defined(DARWIN) || defined(SYMBIAN)
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174 #define PT_NO_SIGTIMEDWAIT
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175 #endif
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176
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177 #if defined(OSF1)
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178 #define PT_PRIO_MIN PRI_OTHER_MIN
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179 #define PT_PRIO_MAX PRI_OTHER_MAX
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180 #elif defined(IRIX)
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181 #include <sys/sched.h>
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182 #define PT_PRIO_MIN PX_PRIO_MIN
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183 #define PT_PRIO_MAX PX_PRIO_MAX
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184 #elif defined(AIX)
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185 #include <sys/priv.h>
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186 #include <sys/sched.h>
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187 #ifndef PTHREAD_CREATE_JOINABLE
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188 #define PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED
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189 #endif
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190 #define PT_PRIO_MIN DEFAULT_PRIO
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191 #define PT_PRIO_MAX DEFAULT_PRIO
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192 #elif defined(HPUX)
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193
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194 #if defined(_PR_DCETHREADS)
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195 #define PT_PRIO_MIN PRI_OTHER_MIN
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196 #define PT_PRIO_MAX PRI_OTHER_MAX
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197 #else /* defined(_PR_DCETHREADS) */
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198 #include <sys/sched.h>
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199 #define PT_PRIO_MIN sched_get_priority_min(SCHED_OTHER)
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200 #define PT_PRIO_MAX sched_get_priority_max(SCHED_OTHER)
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201 #endif /* defined(_PR_DCETHREADS) */
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202
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203 #elif defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
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204 || defined(FREEBSD) || defined(SYMBIAN)
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205 #define PT_PRIO_MIN sched_get_priority_min(SCHED_OTHER)
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206 #define PT_PRIO_MAX sched_get_priority_max(SCHED_OTHER)
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207 #elif defined(NTO)
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208 /*
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209 * Neutrino has functions that return the priority range but
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210 * they return invalid numbers, so I just hard coded these here
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211 * for now. Jerry.Kirk@Nexarecorp.com
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212 */
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213 #define PT_PRIO_MIN 0
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214 #define PT_PRIO_MAX 30
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215 #elif defined(SOLARIS)
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216 /*
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217 * Solaris doesn't seem to have macros for the min/max priorities.
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218 * The range of 0-127 is mentioned in the pthread_setschedparam(3T)
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219 * man pages, and pthread_setschedparam indeed allows 0-127. However,
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220 * pthread_attr_setschedparam does not allow 0; it allows 1-127.
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221 */
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222 #define PT_PRIO_MIN 1
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223 #define PT_PRIO_MAX 127
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224 #elif defined(OPENBSD)
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225 #define PT_PRIO_MIN 0
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226 #define PT_PRIO_MAX 31
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227 #elif defined(NETBSD) \
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228 || defined(BSDI) || defined(DARWIN) || defined(UNIXWARE) \
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229 || defined(RISCOS) /* XXX */
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230 #define PT_PRIO_MIN 0
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231 #define PT_PRIO_MAX 126
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232 #else
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233 #error "pthreads is not supported for this architecture"
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234 #endif
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235
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236 /*
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237 * The _PT_PTHREAD_YIELD function is called from a signal handler.
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238 * Needed for garbage collection -- Look at PR_Suspend/PR_Resume
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239 * implementation.
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240 */
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241 #if defined(_PR_DCETHREADS)
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242 #define _PT_PTHREAD_YIELD() pthread_yield()
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243 #elif defined(OSF1)
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244 /*
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245 * sched_yield can't be called from a signal handler. Must use
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246 * the _np version.
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247 */
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248 #define _PT_PTHREAD_YIELD() pthread_yield_np()
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249 #elif defined(AIX)
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250 extern int (*_PT_aix_yield_fcn)();
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251 #define _PT_PTHREAD_YIELD() (*_PT_aix_yield_fcn)()
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252 #elif defined(IRIX)
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253 #include <time.h>
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254 #define _PT_PTHREAD_YIELD() \
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255 PR_BEGIN_MACRO \
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256 struct timespec onemillisec = {0}; \
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257 onemillisec.tv_nsec = 1000000L; \
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258 nanosleep(&onemillisec,NULL); \
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259 PR_END_MACRO
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260 #elif defined(HPUX) || defined(SOLARIS) \
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261 || defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
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262 || defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \
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263 || defined(BSDI) || defined(NTO) || defined(DARWIN) \
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264 || defined(UNIXWARE) || defined(RISCOS) || defined(SYMBIAN)
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265 #define _PT_PTHREAD_YIELD() sched_yield()
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266 #else
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267 #error "Need to define _PT_PTHREAD_YIELD for this platform"
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268 #endif
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269
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270 #endif /* nspr_pth_defs_h_ */
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