Python/thread_lwp.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 #include <stdlib.h>
  33 #include <lwp/lwp.h>
  34 #include <lwp/stackdep.h>
  35
  36 #define STACKSIZE       1000    /* stacksize for a thread */
  37 #define NSTACKS         2       /* # stacks to be put in cache initialy */
  38
  39 struct lock {
  40         int lock_locked;
  41         cv_t lock_condvar;
  42         mon_t lock_monitor;
  43 };
  44
  45
  46 /*
  47  * Initialization.
  48  */
  49 static void PyThread__init_thread _P0()
  50 {
  51         lwp_setstkcache(STACKSIZE, NSTACKS);
  52 }
  53
  54 /*
  55  * Thread support.
  56  */
  57
  58
  59 int PyThread_start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
  60 {
  61         thread_t tid;
  62         int success;
  63         dprintf(("PyThread_start_new_thread called\n"));
  64         if (!initialized)
  65                 PyThread_init_thread();
  66         success = lwp_create(&tid, func, MINPRIO, 0, lwp_newstk(), 1, arg);
  67         return success < 0 ? 0 : 1;
  68 }
  69
  70 long PyThread_get_thread_ident _P0()
  71 {
  72         thread_t tid;
  73         if (!initialized)
  74                 PyThread_init_thread();
  75         if (lwp_self(&tid) < 0)
  76                 return -1;
  77         return tid.thread_id;
  78 }
  79
  80 static void do_PyThread_exit_thread _P1(no_cleanup, int no_cleanup)
  81 {
  82         dprintf(("PyThread_exit_thread called\n"));
  83         if (!initialized)
  84                 if (no_cleanup)
  85                         _exit(0);
  86                 else
  87                         exit(0);
  88         lwp_destroy(SELF);
  89 }
  90
  91 void PyThread_exit_thread _P0()
  92 {
  93         do_PyThread_exit_thread(0);
  94 }
  95
  96 void PyThread__exit_thread _P0()
  97 {
  98         do_PyThread_exit_thread(1);
  99 }
 100
 101 #ifndef NO_EXIT_PROG
 102 static void do_PyThread_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
 103 {
 104         dprintf(("PyThread_exit_prog(%d) called\n", status));
 105         if (!initialized)
 106                 if (no_cleanup)
 107                         _exit(status);
 108                 else
 109                         exit(status);
 110         pod_exit(status);
 111 }
 112
 113 void PyThread_exit_prog _P1(status, int status)
 114 {
 115         do_PyThread_exit_prog(status, 0);
 116 }
 117
 118 void PyThread__exit_prog _P1(status, int status)
 119 {
 120         do_PyThread_exit_prog(status, 1);
 121 }
 122 #endif /* NO_EXIT_PROG */
 123
 124 /*
 125  * Lock support.
 126  */
 127 PyThread_type_lock PyThread_allocate_lock _P0()
 128 {
 129         struct lock *lock;
 130         extern char *malloc();
 131
 132         dprintf(("PyThread_allocate_lock called\n"));
 133         if (!initialized)
 134                 PyThread_init_thread();
 135
 136         lock = (struct lock *) malloc(sizeof(struct lock));
 137         lock->lock_locked = 0;
 138         (void) mon_create(&lock->lock_monitor);
 139         (void) cv_create(&lock->lock_condvar, lock->lock_monitor);
 140         dprintf(("PyThread_allocate_lock() -> %lx\n", (long)lock));
 141         return (PyThread_type_lock) lock;
 142 }
 143
 144 void PyThread_free_lock _P1(lock, PyThread_type_lock lock)
 145 {
 146         dprintf(("PyThread_free_lock(%lx) called\n", (long)lock));
 147         mon_destroy(((struct lock *) lock)->lock_monitor);
 148         free((char *) lock);
 149 }
 150
 151 int PyThread_acquire_lock _P2(lock, PyThread_type_lock lock, waitflag, int waitflag)
 152 {
 153         int success;
 154
 155         dprintf(("PyThread_acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
 156         success = 0;
 157
 158         (void) mon_enter(((struct lock *) lock)->lock_monitor);
 159         if (waitflag)
 160                 while (((struct lock *) lock)->lock_locked)
 161                         cv_wait(((struct lock *) lock)->lock_condvar);
 162         if (!((struct lock *) lock)->lock_locked) {
 163                 success = 1;
 164                 ((struct lock *) lock)->lock_locked = 1;
 165         }
 166         cv_broadcast(((struct lock *) lock)->lock_condvar);
 167         mon_exit(((struct lock *) lock)->lock_monitor);
 168         dprintf(("PyThread_acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
 169         return success;
 170 }
 171
 172 void PyThread_release_lock _P1(lock, PyThread_type_lock lock)
 173 {
 174         dprintf(("PyThread_release_lock(%lx) called\n", (long)lock));
 175         (void) mon_enter(((struct lock *) lock)->lock_monitor);
 176         ((struct lock *) lock)->lock_locked = 0;
 177         cv_broadcast(((struct lock *) lock)->lock_condvar);
 178         mon_exit(((struct lock *) lock)->lock_monitor);
 179 }
 180
 181 /*
 182  * Semaphore support.
 183  */
 184 PyThread_type_sema PyThread_allocate_sema _P1(value, int value)
 185 {
 186         PyThread_type_sema sema = 0;
 187         dprintf(("PyThread_allocate_sema called\n"));
 188         if (!initialized)
 189                 PyThread_init_thread();
 190
 191         dprintf(("PyThread_allocate_sema() -> %lx\n", (long) sema));
 192         return (PyThread_type_sema) sema;
 193 }
 194
 195 void PyThread_free_sema _P1(sema, PyThread_type_sema sema)
 196 {
 197         dprintf(("PyThread_free_sema(%lx) called\n", (long) sema));
 198 }
 199
 200 int PyThread_down_sema _P2(sema, PyThread_type_sema sema, waitflag, int waitflag)
 201 {
 202         dprintf(("PyThread_down_sema(%lx, %d) called\n", (long) sema, waitflag));
 203         dprintf(("PyThread_down_sema(%lx) return\n", (long) sema));
 204         return -1;
 205 }
 206
 207 void PyThread_up_sema _P1(sema, PyThread_type_sema sema)
 208 {
 209         dprintf(("PyThread_up_sema(%lx)\n", (long) sema));
 210 }