Mercurial > cpython-lru_cache-weakref
annotate Python/thread_os2.h @ 4371:c277ee8c669c legacy-trunk
Sjoerd's thread changes (including down_sema typo fix).
Note: waitflag not supported on NT.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Tue, 08 Oct 1996 14:17:53 +0000 |
| parents | 063a96b49b3e |
| children | 65d2d8e67da3 |
| rev | line source |
|---|---|
| 2649 | 1 /*********************************************************** |
| 2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, | |
| 3 The Netherlands. | |
| 4 | |
| 5 All Rights Reserved | |
| 6 | |
| 7 Permission to use, copy, modify, and distribute this software and its | |
| 8 documentation for any purpose and without fee is hereby granted, | |
| 9 provided that the above copyright notice appear in all copies and that | |
| 10 both that copyright notice and this permission notice appear in | |
| 11 supporting documentation, and that the names of Stichting Mathematisch | |
| 12 Centrum or CWI not be used in advertising or publicity pertaining to | |
| 13 distribution of the software without specific, written prior permission. | |
| 14 | |
| 15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO | |
| 16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE | |
| 18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
| 21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 22 | |
| 23 ******************************************************************/ | |
| 24 | |
| 25 /* This code implemented by cvale@netcom.com */ | |
| 26 | |
| 27 #define INCL_DOSPROCESS | |
| 28 #define INCL_DOSSEMAPHORES | |
| 29 #include "os2.h" | |
| 30 #include "limits.h" | |
| 31 | |
| 32 #include "process.h" | |
| 33 | |
| 34 long get_thread_ident(void); | |
| 35 | |
| 36 | |
| 37 /* | |
| 38 * Initialization of the C package, should not be needed. | |
| 39 */ | |
| 40 static void _init_thread(void) | |
| 41 { | |
| 42 } | |
| 43 | |
| 44 /* | |
| 45 * Thread support. | |
| 46 */ | |
| 47 int start_new_thread(void (*func)(void *), void *arg) | |
| 48 { | |
| 49 int aThread; | |
| 50 int success = 1; | |
| 51 | |
| 52 aThread = _beginthread(func,4096,arg); | |
| 53 | |
| 54 if( aThread == -1 ) { | |
| 55 success = 0; | |
| 56 fprintf(stderr,"aThread failed == %d",aThread); | |
| 57 dprintf(("_beginthread failed. return %ld\n", errno)); | |
| 58 } | |
| 59 | |
| 60 return success; | |
| 61 } | |
| 62 | |
| 63 long get_thread_ident(void) | |
| 64 { | |
| 65 PPIB pib; | |
| 66 PTIB tib; | |
| 67 | |
| 68 if (!initialized) | |
| 69 init_thread(); | |
| 70 | |
| 71 DosGetInfoBlocks(&tib,&pib); | |
| 72 return tib->tib_ptib2->tib2_ultid; | |
| 73 } | |
| 74 | |
| 75 static void do_exit_thread(int no_cleanup) | |
| 76 { | |
| 77 dprintf(("%ld: exit_thread called\n", get_thread_ident())); | |
| 78 if (!initialized) | |
| 79 if (no_cleanup) | |
| 80 _exit(0); | |
| 81 else | |
| 82 exit(0); | |
| 83 _endthread(); | |
| 84 } | |
| 85 | |
| 86 void exit_thread(void) | |
| 87 { | |
| 88 do_exit_thread(0); | |
| 89 } | |
| 90 | |
| 91 void _exit_thread(void) | |
| 92 { | |
| 93 do_exit_thread(1); | |
| 94 } | |
| 95 | |
| 96 #ifndef NO_EXIT_PROG | |
| 97 static void do_exit_prog(int status, int no_cleanup) | |
| 98 { | |
| 99 dprintf(("exit_prog(%d) called\n", status)); | |
| 100 if (!initialized) | |
| 101 if (no_cleanup) | |
| 102 _exit(status); | |
| 103 else | |
| 104 exit(status); | |
| 105 } | |
| 106 | |
| 107 void exit_prog(int status) | |
| 108 { | |
| 109 do_exit_prog(status, 0); | |
| 110 } | |
| 111 | |
| 112 void _exit_prog _P1(int status) | |
| 113 { | |
| 114 do_exit_prog(status, 1); | |
| 115 } | |
| 116 #endif /* NO_EXIT_PROG */ | |
| 117 | |
| 118 /* | |
| 119 * Lock support. It has too be implemented as semaphores. | |
| 120 * I [Dag] tried to implement it with mutex but I could find a way to | |
| 121 * tell whether a thread already own the lock or not. | |
| 122 */ | |
| 123 type_lock allocate_lock(void) | |
| 124 { | |
| 125 HMTX aLock; | |
| 126 APIRET rc; | |
| 127 | |
| 128 dprintf(("allocate_lock called\n")); | |
| 129 if (!initialized) | |
| 130 init_thread(); | |
| 131 | |
| 132 DosCreateMutexSem(NULL, /* Sem name */ | |
| 133 &aLock, /* the semaphone */ | |
| 134 0, /* shared ? */ | |
| 135 0); /* initial state */ | |
| 136 | |
| 137 dprintf(("%ld: allocate_lock() -> %lx\n", get_thread_ident(), (long)aLock)); | |
| 138 | |
| 139 return (type_lock) aLock; | |
| 140 } | |
| 141 | |
| 142 void free_lock(type_lock aLock) | |
| 143 { | |
| 144 dprintf(("%ld: free_lock(%lx) called\n", get_thread_ident(),(long)aLock)); | |
| 145 | |
| 146 DosCloseMutexSem((HMTX)aLock); | |
| 147 } | |
| 148 | |
| 149 /* | |
| 150 * Return 1 on success if the lock was acquired | |
| 151 * | |
| 152 * and 0 if the lock was not acquired. This means a 0 is returned | |
| 153 * if the lock has already been acquired by this thread! | |
| 154 */ | |
| 155 int acquire_lock(type_lock aLock, int waitflag) | |
| 156 { | |
| 157 int success = 1; | |
| 158 ULONG rc, count; | |
| 159 PID pid = 0; | |
| 160 TID tid = 0; | |
| 161 | |
| 162 dprintf(("%ld: acquire_lock(%lx, %d) called\n", get_thread_ident(), | |
| 163 (long)aLock, waitflag)); | |
| 164 | |
| 165 DosQueryMutexSem((HMTX)aLock,&pid,&tid,&count); | |
| 166 if( tid == get_thread_ident() ) { /* if we own this lock */ | |
| 167 success = 0; | |
| 168 } else { | |
| 169 rc = DosRequestMutexSem((HMTX) aLock, | |
| 170 (waitflag == 1 ? SEM_INDEFINITE_WAIT : 0)); | |
| 171 | |
| 172 if( rc != 0) { | |
| 173 success = 0; /* We failed */ | |
| 174 } | |
| 175 } | |
| 176 | |
| 177 dprintf(("%ld: acquire_lock(%lx, %d) -> %d\n", | |
| 178 get_thread_ident(),(long)aLock, waitflag, success)); | |
| 179 | |
| 180 return success; | |
| 181 } | |
| 182 | |
| 183 void release_lock(type_lock aLock) | |
| 184 { | |
| 185 dprintf(("%ld: release_lock(%lx) called\n", get_thread_ident(),(long)aLock)); | |
| 186 | |
| 187 if ( DosReleaseMutexSem( (HMTX) aLock ) != 0 ) { | |
| 188 dprintf(("%ld: Could not release_lock(%lx) error: %l\n", | |
| 189 get_thread_ident(), (long)aLock, GetLastError())); | |
| 190 } | |
| 191 } | |
| 192 | |
| 193 /* | |
| 194 * Semaphore support. | |
| 195 */ | |
| 196 type_sema allocate_sema(int value) | |
| 197 { | |
| 198 return (type_sema) 0; | |
| 199 } | |
| 200 | |
| 201 void free_sema(type_sema aSemaphore) | |
| 202 { | |
| 203 | |
| 204 } | |
| 205 | |
|
4371
c277ee8c669c
Sjoerd's thread changes (including down_sema typo fix).
Guido van Rossum <guido@python.org>
parents:
2649
diff
changeset
|
206 void down_sema(type_sema aSemaphore, int waitflag) |
| 2649 | 207 { |
|
4371
c277ee8c669c
Sjoerd's thread changes (including down_sema typo fix).
Guido van Rossum <guido@python.org>
parents:
2649
diff
changeset
|
208 return -1; |
| 2649 | 209 } |
| 210 | |
| 211 void up_sema(type_sema aSemaphore) | |
| 212 { | |
| 213 dprintf(("%ld: up_sema(%lx)\n", get_thread_ident(), (long)aSemaphore)); | |
| 214 } |