Python/thread_os2.h

   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 or Corporation for National Research Initiatives or
  13 CNRI not be used in advertising or publicity pertaining to
  14 distribution of the software without specific, written prior
  15 permission.
  16
  17 While CWI is the initial source for this software, a modified version
  18 is made available by the Corporation for National Research Initiatives
  19 (CNRI) at the Internet address ftp://ftp.python.org.
  20
  21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
  22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
  23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
  24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
  25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  28 PERFORMANCE OF THIS SOFTWARE.
  29
  30 ******************************************************************/
  31
  32 /* This code implemented by cvale@netcom.com */
  33
  34 #define INCL_DOSPROCESS
  35 #define INCL_DOSSEMAPHORES
  36 #include "os2.h"
  37 #include "limits.h"
  38
  39 #include "process.h"
  40
  41 long PyThread_get_thread_ident(void);
  42
  43
  44 /*
  45  * Initialization of the C package, should not be needed.
  46  */
  47 static void PyThread__init_thread(void)
  48 {
  49 }
  50
  51 /*
  52  * Thread support.
  53  */
  54 int PyThread_start_new_thread(void (*func)(void *), void *arg)
  55 {
  56   int aThread;
  57   int success = 1;
  58
  59   aThread = _beginthread(func,NULL,65536,arg);
  60
  61   if( aThread == -1 ) {
  62     success = 0;
  63     fprintf(stderr,"aThread failed == %d",aThread);
  64     dprintf(("_beginthread failed. return %ld\n", errno));
  65   }
  66
  67   return success;
  68 }
  69
  70 long PyThread_get_thread_ident(void)
  71 {
  72   PPIB pib;
  73   PTIB tib;
  74
  75   if (!initialized)
  76     PyThread_init_thread();
  77
  78   DosGetInfoBlocks(&tib,&pib);
  79   return tib->tib_ptib2->tib2_ultid;
  80 }
  81
  82 static void do_PyThread_exit_thread(int no_cleanup)
  83 {
  84   dprintf(("%ld: PyThread_exit_thread called\n", PyThread_get_thread_ident()));
  85   if (!initialized)
  86     if (no_cleanup)
  87       _exit(0);
  88     else
  89       exit(0);
  90   _endthread();
  91 }
  92
  93 void PyThread_exit_thread(void)
  94 {
  95   do_PyThread_exit_thread(0);
  96 }
  97
  98 void PyThread__exit_thread(void)
  99 {
 100   do_PyThread_exit_thread(1);
 101 }
 102
 103 #ifndef NO_EXIT_PROG
 104 static void do_PyThread_exit_prog(int status, int no_cleanup)
 105 {
 106   dprintf(("PyThread_exit_prog(%d) called\n", status));
 107   if (!initialized)
 108     if (no_cleanup)
 109       _exit(status);
 110     else
 111       exit(status);
 112 }
 113
 114 void PyThread_exit_prog(int status)
 115 {
 116   do_PyThread_exit_prog(status, 0);
 117 }
 118
 119 void PyThread__exit_prog _P1(int status)
 120 {
 121   do_PyThread_exit_prog(status, 1);
 122 }
 123 #endif /* NO_EXIT_PROG */
 124
 125 /*
 126  * Lock support. It has too be implemented as semaphores.
 127  * I [Dag] tried to implement it with mutex but I could find a way to
 128  * tell whether a thread already own the lock or not.
 129  */
 130 PyThread_type_lock PyThread_allocate_lock(void)
 131 {
 132   HMTX   aLock;
 133   APIRET rc;
 134
 135   dprintf(("PyThread_allocate_lock called\n"));
 136   if (!initialized)
 137     PyThread_init_thread();
 138
 139   DosCreateMutexSem(NULL,  /* Sem name      */
 140                     &aLock, /* the semaphone */
 141                     0,     /* shared ?      */
 142                     0);    /* initial state */
 143
 144   dprintf(("%ld: PyThread_allocate_lock() -> %lx\n", PyThread_get_thread_ident(), (long)aLock));
 145
 146   return (PyThread_type_lock) aLock;
 147 }
 148
 149 void PyThread_free_lock(PyThread_type_lock aLock)
 150 {
 151   dprintf(("%ld: PyThread_free_lock(%lx) called\n", PyThread_get_thread_ident(),(long)aLock));
 152
 153   DosCloseMutexSem((HMTX)aLock);
 154 }
 155
 156 /*
 157  * Return 1 on success if the lock was acquired
 158  *
 159  * and 0 if the lock was not acquired. This means a 0 is returned
 160  * if the lock has already been acquired by this thread!
 161  */
 162 int PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
 163 {
 164   int   success = 1;
 165   ULONG rc, count;
 166   PID   pid = 0;
 167   TID   tid = 0;
 168
 169   dprintf(("%ld: PyThread_acquire_lock(%lx, %d) called\n", PyThread_get_thread_ident(),
 170            (long)aLock, waitflag));
 171
 172   DosQueryMutexSem((HMTX)aLock,&pid,&tid,&count);
 173   if( tid == PyThread_get_thread_ident() ) { /* if we own this lock */
 174     success = 0;
 175   } else {
 176     rc = DosRequestMutexSem((HMTX) aLock,
 177                             (waitflag == 1 ? SEM_INDEFINITE_WAIT : 0));
 178
 179     if( rc != 0) {
 180       success = 0;                /* We failed */
 181     }
 182   }
 183
 184   dprintf(("%ld: PyThread_acquire_lock(%lx, %d) -> %d\n",
 185            PyThread_get_thread_ident(),(long)aLock, waitflag, success));
 186
 187   return success;
 188 }
 189
 190 void PyThread_release_lock(PyThread_type_lock aLock)
 191 {
 192   dprintf(("%ld: PyThread_release_lock(%lx) called\n", PyThread_get_thread_ident(),(long)aLock));
 193
 194   if ( DosReleaseMutexSem( (HMTX) aLock ) != 0 ) {
 195     dprintf(("%ld: Could not PyThread_release_lock(%lx) error: %l\n",
 196              PyThread_get_thread_ident(), (long)aLock, GetLastError()));
 197   }
 198 }
 199
 200 /*
 201  * Semaphore support.
 202  */
 203 PyThread_type_sema PyThread_allocate_sema(int value)
 204 {
 205   return (PyThread_type_sema) 0;
 206 }
 207
 208 void PyThread_free_sema(PyThread_type_sema aSemaphore)
 209 {
 210
 211 }
 212
 213 int PyThread_down_sema(PyThread_type_sema aSemaphore, int waitflag)
 214 {
 215   return -1;
 216 }
 217
 218 void PyThread_up_sema(PyThread_type_sema aSemaphore)
 219 {
 220   dprintf(("%ld: PyThread_up_sema(%lx)\n", PyThread_get_thread_ident(), (long)aSemaphore));
 221 }