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annotate Python/thread_lwp.h @ 57675:087fe5fa113c

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Merged revisions 76534,76538,76628,76701,76774 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r76534 | martin.v.loewis | 2009-11-26 02:42:05 -0600 (Thu, 26 Nov 2009) | 2 lines Fix typo. ........ r76538 | georg.brandl | 2009-11-26 14:48:25 -0600 (Thu, 26 Nov 2009) | 1 line #7400: typo. ........ r76628 | andrew.kuchling | 2009-12-02 08:27:11 -0600 (Wed, 02 Dec 2009) | 1 line Markup fixes ........ r76701 | andrew.kuchling | 2009-12-07 20:37:05 -0600 (Mon, 07 Dec 2009) | 1 line Typo fix; grammar fix ........ r76774 | benjamin.peterson | 2009-12-12 18:54:15 -0600 (Sat, 12 Dec 2009) | 1 line account for PyObject_IsInstance's new ability to fail ........
author Benjamin Peterson <benjamin@python.org>
date Sun, 13 Dec 2009 01:23:39 +0000
parents 8b116a8449bd
children e38335d4df91 df5719c298db
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1
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2 #include <stdlib.h>
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3 #include <lwp/lwp.h>
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4 #include <lwp/stackdep.h>
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5
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6 #define STACKSIZE 1000 /* stacksize for a thread */
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7 #define NSTACKS 2 /* # stacks to be put in cache initially */
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9 struct lock {
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10 int lock_locked;
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11 cv_t lock_condvar;
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12 mon_t lock_monitor;
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13 };
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16 /*
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17 * Initialization.
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18 */
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19 static void PyThread__init_thread(void)
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20 {
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21 lwp_setstkcache(STACKSIZE, NSTACKS);
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22 }
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23
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24 /*
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25 * Thread support.
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26 */
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29 long PyThread_start_new_thread(void (*func)(void *), void *arg)
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30 {
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31 thread_t tid;
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32 int success;
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33 dprintf(("PyThread_start_new_thread called\n"));
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34 if (!initialized)
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35 PyThread_init_thread();
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36 success = lwp_create(&tid, func, MINPRIO, 0, lwp_newstk(), 1, arg);
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37 return success < 0 ? -1 : 0;
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38 }
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39
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40 long PyThread_get_thread_ident(void)
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41 {
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42 thread_t tid;
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43 if (!initialized)
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44 PyThread_init_thread();
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45 if (lwp_self(&tid) < 0)
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46 return -1;
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47 return tid.thread_id;
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48 }
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49
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50 static void do_PyThread_exit_thread(int no_cleanup)
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51 {
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52 dprintf(("PyThread_exit_thread called\n"));
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53 if (!initialized)
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54 if (no_cleanup)
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55 _exit(0);
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56 else
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57 exit(0);
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58 lwp_destroy(SELF);
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59 }
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61 void PyThread_exit_thread(void)
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62 {
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63 do_PyThread_exit_thread(0);
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64 }
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66 void PyThread__exit_thread(void)
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67 {
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68 do_PyThread_exit_thread(1);
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69 }
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70
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71 #ifndef NO_EXIT_PROG
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72 static void do_PyThread_exit_prog(int status, int no_cleanup)
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73 {
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74 dprintf(("PyThread_exit_prog(%d) called\n", status));
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75 if (!initialized)
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76 if (no_cleanup)
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77 _exit(status);
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78 else
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79 exit(status);
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80 pod_exit(status);
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81 }
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82
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83 void PyThread_exit_prog(int status)
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84 {
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85 do_PyThread_exit_prog(status, 0);
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86 }
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87
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88 void PyThread__exit_prog(int status)
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89 {
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90 do_PyThread_exit_prog(status, 1);
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91 }
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92 #endif /* NO_EXIT_PROG */
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93
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94 /*
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95 * Lock support.
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96 */
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97 PyThread_type_lock PyThread_allocate_lock(void)
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98 {
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99 struct lock *lock;
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100 extern char *malloc(size_t);
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101
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102 dprintf(("PyThread_allocate_lock called\n"));
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103 if (!initialized)
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104 PyThread_init_thread();
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105
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106 lock = (struct lock *) malloc(sizeof(struct lock));
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107 lock->lock_locked = 0;
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108 (void) mon_create(&lock->lock_monitor);
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109 (void) cv_create(&lock->lock_condvar, lock->lock_monitor);
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110 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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111 return (PyThread_type_lock) lock;
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112 }
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113
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114 void PyThread_free_lock(PyThread_type_lock lock)
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115 {
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116 dprintf(("PyThread_free_lock(%p) called\n", lock));
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117 mon_destroy(((struct lock *) lock)->lock_monitor);
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118 free((char *) lock);
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119 }
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120
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121 int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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122 {
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123 int success;
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124
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125 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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126 success = 0;
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127
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128 (void) mon_enter(((struct lock *) lock)->lock_monitor);
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129 if (waitflag)
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130 while (((struct lock *) lock)->lock_locked)
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131 cv_wait(((struct lock *) lock)->lock_condvar);
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132 if (!((struct lock *) lock)->lock_locked) {
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133 success = 1;
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134 ((struct lock *) lock)->lock_locked = 1;
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135 }
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136 cv_broadcast(((struct lock *) lock)->lock_condvar);
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137 mon_exit(((struct lock *) lock)->lock_monitor);
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138 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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139 return success;
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140 }
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141
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142 void PyThread_release_lock(PyThread_type_lock lock)
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143 {
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144 dprintf(("PyThread_release_lock(%p) called\n", lock));
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145 (void) mon_enter(((struct lock *) lock)->lock_monitor);
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146 ((struct lock *) lock)->lock_locked = 0;
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147 cv_broadcast(((struct lock *) lock)->lock_condvar);
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148 mon_exit(((struct lock *) lock)->lock_monitor);
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149 }