home *** CD-ROM | disk | FTP | other *** search
- /***********************************************************
- Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum,
- Amsterdam, The Netherlands.
-
- All Rights Reserved
-
- Permission to use, copy, modify, and distribute this software and its
- documentation for any purpose and without fee is hereby granted,
- provided that the above copyright notice appear in all copies and that
- both that copyright notice and this permission notice appear in
- supporting documentation, and that the names of Stichting Mathematisch
- Centrum or CWI not be used in advertising or publicity pertaining to
- distribution of the software without specific, written prior permission.
-
- STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
- THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
- FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
- FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
- OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
- ******************************************************************/
-
- #include <stdlib.h>
- #include <lwp/lwp.h>
- #include <lwp/stackdep.h>
-
- #define STACKSIZE 1000 /* stacksize for a thread */
- #define NSTACKS 2 /* # stacks to be put in cache initialy */
-
- struct lock {
- int lock_locked;
- cv_t lock_condvar;
- mon_t lock_monitor;
- };
-
-
- /*
- * Initialization.
- */
- static void _init_thread _P0()
- {
- lwp_setstkcache(STACKSIZE, NSTACKS);
- }
-
- /*
- * Thread support.
- */
-
-
- int start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
- {
- thread_t tid;
- int success;
- dprintf(("start_new_thread called\n"));
- if (!initialized)
- init_thread();
- success = lwp_create(&tid, func, MINPRIO, 0, lwp_newstk(), 1, arg);
- return success < 0 ? 0 : 1;
- }
-
- long get_thread_ident _P0()
- {
- thread_t tid;
- if (!initialized)
- init_thread();
- if (lwp_self(&tid) < 0)
- return -1;
- return tid.thread_id;
- }
-
- static void do_exit_thread _P1(no_cleanup, int no_cleanup)
- {
- dprintf(("exit_thread called\n"));
- if (!initialized)
- if (no_cleanup)
- _exit(0);
- else
- exit(0);
- lwp_destroy(SELF);
- }
-
- void exit_thread _P0()
- {
- do_exit_thread(0);
- }
-
- void _exit_thread _P0()
- {
- do_exit_thread(1);
- }
-
- #ifndef NO_EXIT_PROG
- static void do_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
- {
- dprintf(("exit_prog(%d) called\n", status));
- if (!initialized)
- if (no_cleanup)
- _exit(status);
- else
- exit(status);
- pod_exit(status);
- }
-
- void exit_prog _P1(status, int status)
- {
- do_exit_prog(status, 0);
- }
-
- void _exit_prog _P1(status, int status)
- {
- do_exit_prog(status, 1);
- }
- #endif /* NO_EXIT_PROG */
-
- /*
- * Lock support.
- */
- type_lock allocate_lock _P0()
- {
- struct lock *lock;
- extern char *malloc();
-
- dprintf(("allocate_lock called\n"));
- if (!initialized)
- init_thread();
-
- lock = (struct lock *) malloc(sizeof(struct lock));
- lock->lock_locked = 0;
- (void) mon_create(&lock->lock_monitor);
- (void) cv_create(&lock->lock_condvar, lock->lock_monitor);
- dprintf(("allocate_lock() -> %lx\n", (long)lock));
- return (type_lock) lock;
- }
-
- void free_lock _P1(lock, type_lock lock)
- {
- dprintf(("free_lock(%lx) called\n", (long)lock));
- mon_destroy(((struct lock *) lock)->lock_monitor);
- free((char *) lock);
- }
-
- int acquire_lock _P2(lock, type_lock lock, waitflag, int waitflag)
- {
- int success;
-
- dprintf(("acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
- success = 0;
-
- (void) mon_enter(((struct lock *) lock)->lock_monitor);
- if (waitflag)
- while (((struct lock *) lock)->lock_locked)
- cv_wait(((struct lock *) lock)->lock_condvar);
- if (!((struct lock *) lock)->lock_locked) {
- success = 1;
- ((struct lock *) lock)->lock_locked = 1;
- }
- cv_broadcast(((struct lock *) lock)->lock_condvar);
- mon_exit(((struct lock *) lock)->lock_monitor);
- dprintf(("acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
- return success;
- }
-
- void release_lock _P1(lock, type_lock lock)
- {
- dprintf(("release_lock(%lx) called\n", (long)lock));
- (void) mon_enter(((struct lock *) lock)->lock_monitor);
- ((struct lock *) lock)->lock_locked = 0;
- cv_broadcast(((struct lock *) lock)->lock_condvar);
- mon_exit(((struct lock *) lock)->lock_monitor);
- }
-
- /*
- * Semaphore support.
- */
- type_sema allocate_sema _P1(value, int value)
- {
- type_sema sema = 0;
- dprintf(("allocate_sema called\n"));
- if (!initialized)
- init_thread();
-
- dprintf(("allocate_sema() -> %lx\n", (long) sema));
- return (type_sema) sema;
- }
-
- void free_sema _P1(sema, type_sema sema)
- {
- dprintf(("free_sema(%lx) called\n", (long) sema));
- }
-
- void down_sema _P1(sema, type_sema sema)
- {
- dprintf(("down_sema(%lx) called\n", (long) sema));
- dprintf(("down_sema(%lx) return\n", (long) sema));
- }
-
- void up_sema _P1(sema, type_sema sema)
- {
- dprintf(("up_sema(%lx)\n", (long) sema));
- }
-