Mercurial > cpython-lru_cache-weakref
annotate Python/thread_os2.h @ 16862:77a5470299db legacy-trunk
Add warning/error handlin for problematic nested scopes cases as
described in PEP 227.
symtable_check_unoptimized() warns about import * and exec with "in"
when it is used in a function that contains a nested function with
free variables. Warnings are issued unless nested scopes are in
effect, in which case these are SyntaxErrors.
symtable_check_shadow() warns about assignments in a function scope
that shadow free variables defined in a nested scope. This will
always generate a warning -- and will behave differently with nested
scopes than without.
Restore full checking for free vars in children, even when nested
scopes are not enabled. This is needed to support warnings for
shadowing.
Change symtable_warn() to return an int-- the return value of
PyErr_WarnExplicit.
Sundry cleanup: Remove commented out code. Break long lines.
| author | Jeremy Hylton <jeremy@alum.mit.edu> |
|---|---|
| date | Wed, 28 Feb 2001 22:54:51 +0000 |
| parents | 6f6f965c5e2d |
| children | ebfd87e87884 |
| rev | line source |
|---|---|
| 2649 | 1 /* This code implemented by cvale@netcom.com */ |
| 2 | |
| 3 #define INCL_DOSPROCESS | |
| 4 #define INCL_DOSSEMAPHORES | |
| 5 #include "os2.h" | |
| 6 #include "limits.h" | |
| 7 | |
| 8 #include "process.h" | |
| 9 | |
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10 long PyThread_get_thread_ident(void); |
| 2649 | 11 |
| 12 | |
| 13 /* | |
| 14 * Initialization of the C package, should not be needed. | |
| 15 */ | |
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16 static void |
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17 PyThread__init_thread(void) |
| 2649 | 18 { |
| 19 } | |
| 20 | |
| 21 /* | |
| 22 * Thread support. | |
| 23 */ | |
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24 int |
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25 PyThread_start_new_thread(void (*func)(void *), void *arg) |
| 2649 | 26 { |
| 27 int aThread; | |
| 28 int success = 1; | |
| 29 | |
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30 aThread = _beginthread(func,NULL,65536,arg); |
| 2649 | 31 |
| 32 if( aThread == -1 ) { | |
| 33 success = 0; | |
| 34 fprintf(stderr,"aThread failed == %d",aThread); | |
| 35 dprintf(("_beginthread failed. return %ld\n", errno)); | |
| 36 } | |
| 37 | |
| 38 return success; | |
| 39 } | |
| 40 | |
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41 long |
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42 PyThread_get_thread_ident(void) |
| 2649 | 43 { |
| 44 PPIB pib; | |
| 45 PTIB tib; | |
| 46 | |
| 47 if (!initialized) | |
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48 PyThread_init_thread(); |
| 2649 | 49 |
| 50 DosGetInfoBlocks(&tib,&pib); | |
| 51 return tib->tib_ptib2->tib2_ultid; | |
| 52 } | |
| 53 | |
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54 static void |
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55 do_PyThread_exit_thread(int no_cleanup) |
| 2649 | 56 { |
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57 dprintf(("%ld: PyThread_exit_thread called\n", PyThread_get_thread_ident())); |
| 2649 | 58 if (!initialized) |
| 59 if (no_cleanup) | |
| 60 _exit(0); | |
| 61 else | |
| 62 exit(0); | |
| 63 _endthread(); | |
| 64 } | |
| 65 | |
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66 void |
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67 PyThread_exit_thread(void) |
| 2649 | 68 { |
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69 do_PyThread_exit_thread(0); |
| 2649 | 70 } |
| 71 | |
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72 void |
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73 PyThread__exit_thread(void) |
| 2649 | 74 { |
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75 do_PyThread_exit_thread(1); |
| 2649 | 76 } |
| 77 | |
| 78 #ifndef NO_EXIT_PROG | |
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79 static void |
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80 do_PyThread_exit_prog(int status, int no_cleanup) |
| 2649 | 81 { |
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82 dprintf(("PyThread_exit_prog(%d) called\n", status)); |
| 2649 | 83 if (!initialized) |
| 84 if (no_cleanup) | |
| 85 _exit(status); | |
| 86 else | |
| 87 exit(status); | |
| 88 } | |
| 89 | |
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90 void |
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91 PyThread_exit_prog(int status) |
| 2649 | 92 { |
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93 do_PyThread_exit_prog(status, 0); |
| 2649 | 94 } |
| 95 | |
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96 void |
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97 PyThread__exit_prog(int status) |
| 2649 | 98 { |
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99 do_PyThread_exit_prog(status, 1); |
| 2649 | 100 } |
| 101 #endif /* NO_EXIT_PROG */ | |
| 102 | |
| 103 /* | |
| 104 * Lock support. It has too be implemented as semaphores. | |
| 105 * I [Dag] tried to implement it with mutex but I could find a way to | |
| 106 * tell whether a thread already own the lock or not. | |
| 107 */ | |
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108 PyThread_type_lock |
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109 PyThread_allocate_lock(void) |
| 2649 | 110 { |
| 111 HMTX aLock; | |
| 112 APIRET rc; | |
| 113 | |
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114 dprintf(("PyThread_allocate_lock called\n")); |
| 2649 | 115 if (!initialized) |
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116 PyThread_init_thread(); |
| 2649 | 117 |
| 118 DosCreateMutexSem(NULL, /* Sem name */ | |
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119 &aLock, /* the semaphore */ |
| 2649 | 120 0, /* shared ? */ |
| 121 0); /* initial state */ | |
| 122 | |
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123 dprintf(("%ld: PyThread_allocate_lock() -> %p\n", PyThread_get_thread_ident(), aLock)); |
| 2649 | 124 |
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125 return (PyThread_type_lock) aLock; |
| 2649 | 126 } |
| 127 | |
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128 void |
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129 PyThread_free_lock(PyThread_type_lock aLock) |
| 2649 | 130 { |
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131 dprintf(("%ld: PyThread_free_lock(%p) called\n", PyThread_get_thread_ident(),aLock)); |
| 2649 | 132 |
| 133 DosCloseMutexSem((HMTX)aLock); | |
| 134 } | |
| 135 | |
| 136 /* | |
| 137 * Return 1 on success if the lock was acquired | |
| 138 * | |
| 139 * and 0 if the lock was not acquired. This means a 0 is returned | |
| 140 * if the lock has already been acquired by this thread! | |
| 141 */ | |
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142 int |
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143 PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag) |
| 2649 | 144 { |
| 145 int success = 1; | |
| 146 ULONG rc, count; | |
| 147 PID pid = 0; | |
| 148 TID tid = 0; | |
| 149 | |
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150 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n", PyThread_get_thread_ident(), |
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151 aLock, waitflag)); |
| 2649 | 152 |
| 153 DosQueryMutexSem((HMTX)aLock,&pid,&tid,&count); | |
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154 if( tid == PyThread_get_thread_ident() ) { /* if we own this lock */ |
| 2649 | 155 success = 0; |
| 156 } else { | |
| 157 rc = DosRequestMutexSem((HMTX) aLock, | |
| 158 (waitflag == 1 ? SEM_INDEFINITE_WAIT : 0)); | |
| 159 | |
| 160 if( rc != 0) { | |
| 161 success = 0; /* We failed */ | |
| 162 } | |
| 163 } | |
| 164 | |
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165 dprintf(("%ld: PyThread_acquire_lock(%p, %d) -> %d\n", |
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166 PyThread_get_thread_ident(),aLock, waitflag, success)); |
| 2649 | 167 |
| 168 return success; | |
| 169 } | |
| 170 | |
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171 void |
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172 PyThread_release_lock(PyThread_type_lock aLock) |
| 2649 | 173 { |
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174 dprintf(("%ld: PyThread_release_lock(%p) called\n", PyThread_get_thread_ident(),aLock)); |
| 2649 | 175 |
| 176 if ( DosReleaseMutexSem( (HMTX) aLock ) != 0 ) { | |
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177 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n", |
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178 PyThread_get_thread_ident(), aLock, GetLastError())); |
| 2649 | 179 } |
| 180 } | |
| 181 | |
| 182 /* | |
| 183 * Semaphore support. | |
| 184 */ | |
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185 PyThread_type_sema |
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186 PyThread_allocate_sema(int value) |
| 2649 | 187 { |
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188 return (PyThread_type_sema) 0; |
| 2649 | 189 } |
| 190 | |
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191 void |
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192 PyThread_free_sema(PyThread_type_sema aSemaphore) |
| 2649 | 193 { |
| 194 | |
| 195 } | |
| 196 | |
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197 int |
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198 PyThread_down_sema(PyThread_type_sema aSemaphore, int waitflag) |
| 2649 | 199 { |
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200 return -1; |
| 2649 | 201 } |
| 202 | |
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203 void |
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204 PyThread_up_sema(PyThread_type_sema aSemaphore) |
| 2649 | 205 { |
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206 dprintf(("%ld: PyThread_up_sema(%p)\n", PyThread_get_thread_ident(), aSemaphore)); |
| 2649 | 207 } |