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 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 #include <stdlib.h>
  26 #include <lwp/lwp.h>
  27 #include <lwp/stackdep.h>
  28
  29 #define STACKSIZE       1000    /* stacksize for a thread */
  30 #define NSTACKS         2       /* # stacks to be put in cache initialy */
  31
  32 struct lock {
  33         int lock_locked;
  34         cv_t lock_condvar;
  35         mon_t lock_monitor;
  36 };
  37
  38
  39 /*
  40  * Initialization.
  41  */
  42 static void _init_thread _P0()
  43 {
  44         lwp_setstkcache(STACKSIZE, NSTACKS);
  45 }
  46
  47 /*
  48  * Thread support.
  49  */
  50
  51
  52 int start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
  53 {
  54         thread_t tid;
  55         int success;
  56         dprintf(("start_new_thread called\n"));
  57         if (!initialized)
  58                 init_thread();
  59         success = lwp_create(&tid, func, MINPRIO, 0, lwp_newstk(), 1, arg);
  60         return success < 0 ? 0 : 1;
  61 }
  62
  63 long get_thread_ident _P0()
  64 {
  65         thread_t tid;
  66         if (!initialized)
  67                 init_thread();
  68         if (lwp_self(&tid) < 0)
  69                 return -1;
  70         return tid.thread_id;
  71 }
  72
  73 static void do_exit_thread _P1(no_cleanup, int no_cleanup)
  74 {
  75         dprintf(("exit_thread called\n"));
  76         if (!initialized)
  77                 if (no_cleanup)
  78                         _exit(0);
  79                 else
  80                         exit(0);
  81         lwp_destroy(SELF);
  82 }
  83
  84 void exit_thread _P0()
  85 {
  86         do_exit_thread(0);
  87 }
  88
  89 void _exit_thread _P0()
  90 {
  91         do_exit_thread(1);
  92 }
  93
  94 #ifndef NO_EXIT_PROG
  95 static void do_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
  96 {
  97         dprintf(("exit_prog(%d) called\n", status));
  98         if (!initialized)
  99                 if (no_cleanup)
 100                         _exit(status);
 101                 else
 102                         exit(status);
 103         pod_exit(status);
 104 }
 105
 106 void exit_prog _P1(status, int status)
 107 {
 108         do_exit_prog(status, 0);
 109 }
 110
 111 void _exit_prog _P1(status, int status)
 112 {
 113         do_exit_prog(status, 1);
 114 }
 115 #endif /* NO_EXIT_PROG */
 116
 117 /*
 118  * Lock support.
 119  */
 120 type_lock allocate_lock _P0()
 121 {
 122         struct lock *lock;
 123         extern char *malloc();
 124
 125         dprintf(("allocate_lock called\n"));
 126         if (!initialized)
 127                 init_thread();
 128
 129         lock = (struct lock *) malloc(sizeof(struct lock));
 130         lock->lock_locked = 0;
 131         (void) mon_create(&lock->lock_monitor);
 132         (void) cv_create(&lock->lock_condvar, lock->lock_monitor);
 133         dprintf(("allocate_lock() -> %lx\n", (long)lock));
 134         return (type_lock) lock;
 135 }
 136
 137 void free_lock _P1(lock, type_lock lock)
 138 {
 139         dprintf(("free_lock(%lx) called\n", (long)lock));
 140         mon_destroy(((struct lock *) lock)->lock_monitor);
 141         free((char *) lock);
 142 }
 143
 144 int acquire_lock _P2(lock, type_lock lock, waitflag, int waitflag)
 145 {
 146         int success;
 147
 148         dprintf(("acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
 149         success = 0;
 150
 151         (void) mon_enter(((struct lock *) lock)->lock_monitor);
 152         if (waitflag)
 153                 while (((struct lock *) lock)->lock_locked)
 154                         cv_wait(((struct lock *) lock)->lock_condvar);
 155         if (!((struct lock *) lock)->lock_locked) {
 156                 success = 1;
 157                 ((struct lock *) lock)->lock_locked = 1;
 158         }
 159         cv_broadcast(((struct lock *) lock)->lock_condvar);
 160         mon_exit(((struct lock *) lock)->lock_monitor);
 161         dprintf(("acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
 162         return success;
 163 }
 164
 165 void release_lock _P1(lock, type_lock lock)
 166 {
 167         dprintf(("release_lock(%lx) called\n", (long)lock));
 168         (void) mon_enter(((struct lock *) lock)->lock_monitor);
 169         ((struct lock *) lock)->lock_locked = 0;
 170         cv_broadcast(((struct lock *) lock)->lock_condvar);
 171         mon_exit(((struct lock *) lock)->lock_monitor);
 172 }
 173
 174 /*
 175  * Semaphore support.
 176  */
 177 type_sema allocate_sema _P1(value, int value)
 178 {
 179         type_sema sema = 0;
 180         dprintf(("allocate_sema called\n"));
 181         if (!initialized)
 182                 init_thread();
 183
 184         dprintf(("allocate_sema() -> %lx\n", (long) sema));
 185         return (type_sema) sema;
 186 }
 187
 188 void free_sema _P1(sema, type_sema sema)
 189 {
 190         dprintf(("free_sema(%lx) called\n", (long) sema));
 191 }
 192
 193 void down_sema _P1(sema, type_sema sema)
 194 {
 195         dprintf(("down_sema(%lx) called\n", (long) sema));
 196         dprintf(("down_sema(%lx) return\n", (long) sema));
 197 }
 198
 199 void up_sema _P1(sema, type_sema sema)
 200 {
 201         dprintf(("up_sema(%lx)\n", (long) sema));
 202 }