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- /***********************************************************
- 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.
-
- ******************************************************************/
-
- #ifdef WITH_SGI_DL
- #define USE_DL
- #endif
-
- #include <stdlib.h>
- #include <stdio.h>
- #include <signal.h>
- #include <sys/types.h>
- #include <sys/wait.h>
- #include <sys/prctl.h>
- #include <ulocks.h>
- #include <errno.h>
-
- #define HDR_SIZE 2680 /* sizeof(ushdr_t) */
- #define MAXPROC 100 /* max # of threads that can be started */
-
- static usptr_t *shared_arena;
- static ulock_t count_lock; /* protection for some variables */
- static ulock_t wait_lock; /* lock used to wait for other threads */
- static int waiting_for_threads; /* protected by count_lock */
- static int nthreads; /* protected by count_lock */
- static int exit_status;
- #ifndef NO_EXIT_PROG
- static int do_exit; /* indicates that the program is to exit */
- #endif
- static int exiting; /* we're already exiting (for maybe_exit) */
- static pid_t my_pid; /* PID of main thread */
- static struct pidlist {
- pid_t parent;
- pid_t child;
- } pidlist[MAXPROC]; /* PIDs of other threads; protected by count_lock */
- static int maxpidindex; /* # of PIDs in pidlist */
-
- #ifndef NO_EXIT_PROG
- /*
- * This routine is called as a signal handler when another thread
- * exits. When that happens, we must see whether we have to exit as
- * well (because of an exit_prog()) or whether we should continue on.
- */
- static void exit_sig _P0()
- {
- d2printf(("exit_sig called\n"));
- if (exiting && getpid() == my_pid) {
- d2printf(("already exiting\n"));
- return;
- }
- if (do_exit) {
- d2printf(("exiting in exit_sig\n"));
- #ifdef DEBUG
- if ((thread_debug & 8) == 0)
- thread_debug &= ~1; /* don't produce debug messages */
- #endif
- exit_thread();
- }
- }
-
- /*
- * This routine is called when a process calls exit(). If that wasn't
- * done from the library, we do as if an exit_prog() was intended.
- */
- static void maybe_exit _P0()
- {
- dprintf(("maybe_exit called\n"));
- if (exiting) {
- dprintf(("already exiting\n"));
- return;
- }
- exit_prog(0);
- }
- #endif /* NO_EXIT_PROG */
-
- /*
- * Initialization.
- */
- static void _init_thread _P0()
- {
- #ifndef NO_EXIT_PROG
- struct sigaction s;
- #endif /* NO_EXIT_PROG */
- #ifdef USE_DL
- long addr, size;
- #endif /* USE_DL */
-
-
- #ifdef USE_DL
- if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
- perror("usconfig - CONF_INITSIZE (check)");
- if (usconfig(CONF_INITSIZE, size) < 0)
- perror("usconfig - CONF_INITSIZE (reset)");
- addr = (long) dl_getrange(size + HDR_SIZE);
- dprintf(("trying to use addr %lx-%lx for shared arena\n", addr, addr+size));
- errno = 0;
- if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 && errno != 0)
- perror("usconfig - CONF_ATTACHADDR (set)");
- #endif /* USE_DL */
- if (usconfig(CONF_INITUSERS, 16) < 0)
- perror("usconfig - CONF_INITUSERS");
- my_pid = getpid(); /* so that we know which is the main thread */
- #ifndef NO_EXIT_PROG
- atexit(maybe_exit);
- s.sa_handler = exit_sig;
- sigemptyset(&s.sa_mask);
- /*sigaddset(&s.sa_mask, SIGUSR1);*/
- s.sa_flags = 0;
- sigaction(SIGUSR1, &s, 0);
- if (prctl(PR_SETEXITSIG, SIGUSR1) < 0)
- perror("prctl - PR_SETEXITSIG");
- #endif /* NO_EXIT_PROG */
- if (usconfig(CONF_ARENATYPE, US_SHAREDONLY) < 0)
- perror("usconfig - CONF_ARENATYPE");
- usconfig(CONF_LOCKTYPE, US_DEBUG); /* XXX */
- #ifdef DEBUG
- if (thread_debug & 4)
- usconfig(CONF_LOCKTYPE, US_DEBUGPLUS);
- else if (thread_debug & 2)
- usconfig(CONF_LOCKTYPE, US_DEBUG);
- #endif /* DEBUG */
- if ((shared_arena = usinit(tmpnam(0))) == 0)
- perror("usinit");
- #ifdef USE_DL
- if (usconfig(CONF_ATTACHADDR, addr) < 0) /* reset address */
- perror("usconfig - CONF_ATTACHADDR (reset)");
- #endif /* USE_DL */
- if ((count_lock = usnewlock(shared_arena)) == NULL)
- perror("usnewlock (count_lock)");
- (void) usinitlock(count_lock);
- if ((wait_lock = usnewlock(shared_arena)) == NULL)
- perror("usnewlock (wait_lock)");
- dprintf(("arena start: %lx, arena size: %ld\n", (long) shared_arena, (long) usconfig(CONF_GETSIZE, shared_arena)));
- }
-
- /*
- * Thread support.
- */
-
- static void clean_threads _P0()
- {
- int i, j;
- pid_t mypid, pid;
-
- /* clean up any exited threads */
- mypid = getpid();
- i = 0;
- while (i < maxpidindex) {
- if (pidlist[i].parent == mypid && (pid = pidlist[i].child) > 0) {
- pid = waitpid(pid, 0, WNOHANG);
- if (pid > 0) {
- /* a thread has exited */
- pidlist[i] = pidlist[--maxpidindex];
- /* remove references to children of dead proc */
- for (j = 0; j < maxpidindex; j++)
- if (pidlist[j].parent == pid)
- pidlist[j].child = -1;
- continue; /* don't increment i */
- }
- }
- i++;
- }
- /* clean up the list */
- i = 0;
- while (i < maxpidindex) {
- if (pidlist[i].child == -1) {
- pidlist[i] = pidlist[--maxpidindex];
- continue; /* don't increment i */
- }
- i++;
- }
- }
-
- int start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
- {
- #ifdef USE_DL
- long addr, size;
- static int local_initialized = 0;
- #endif /* USE_DL */
- int success = 0; /* init not needed when SOLARIS_THREADS and */
- /* C_THREADS implemented properly */
-
- dprintf(("start_new_thread called\n"));
- if (!initialized)
- init_thread();
- switch (ussetlock(count_lock)) {
- case 0: return 0;
- case -1: perror("ussetlock (count_lock)");
- }
- if (maxpidindex >= MAXPROC)
- success = -1;
- else {
- #ifdef USE_DL
- if (!local_initialized) {
- if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
- perror("usconfig - CONF_INITSIZE (check)");
- if (usconfig(CONF_INITSIZE, size) < 0)
- perror("usconfig - CONF_INITSIZE (reset)");
- addr = (long) dl_getrange(size + HDR_SIZE);
- dprintf(("trying to use addr %lx-%lx for sproc\n",
- addr, addr+size));
- errno = 0;
- if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 &&
- errno != 0)
- perror("usconfig - CONF_ATTACHADDR (set)");
- }
- #endif /* USE_DL */
- clean_threads();
- if ((success = sproc(func, PR_SALL, arg)) < 0)
- perror("sproc");
- #ifdef USE_DL
- if (!local_initialized) {
- if (usconfig(CONF_ATTACHADDR, addr) < 0)
- /* reset address */
- perror("usconfig - CONF_ATTACHADDR (reset)");
- local_initialized = 1;
- }
- #endif /* USE_DL */
- if (success >= 0) {
- nthreads++;
- pidlist[maxpidindex].parent = getpid();
- pidlist[maxpidindex++].child = success;
- dprintf(("pidlist[%d] = %d\n",
- maxpidindex-1, success));
- }
- }
- if (usunsetlock(count_lock) < 0)
- perror("usunsetlock (count_lock)");
- return success < 0 ? 0 : 1;
- }
-
- long get_thread_ident _P0()
- {
- return getpid();
- }
-
- 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);
- if (ussetlock(count_lock) < 0)
- perror("ussetlock (count_lock)");
- nthreads--;
- if (getpid() == my_pid) {
- /* main thread; wait for other threads to exit */
- exiting = 1;
- #ifndef NO_EXIT_PROG
- if (do_exit) {
- int i;
-
- /* notify other threads */
- clean_threads();
- if (nthreads >= 0) {
- dprintf(("kill other threads\n"));
- for (i = 0; i < maxpidindex; i++)
- if (pidlist[i].child > 0)
- (void) kill(pidlist[i].child,
- SIGKILL);
- _exit(exit_status);
- }
- }
- #endif /* NO_EXIT_PROG */
- waiting_for_threads = 1;
- if (ussetlock(wait_lock) < 0)
- perror("ussetlock (wait_lock)");
- for (;;) {
- if (nthreads < 0) {
- dprintf(("really exit (%d)\n", exit_status));
- if (no_cleanup)
- _exit(exit_status);
- else
- exit(exit_status);
- }
- if (usunsetlock(count_lock) < 0)
- perror("usunsetlock (count_lock)");
- dprintf(("waiting for other threads (%d)\n", nthreads));
- if (ussetlock(wait_lock) < 0)
- perror("ussetlock (wait_lock)");
- if (ussetlock(count_lock) < 0)
- perror("ussetlock (count_lock)");
- }
- }
- /* not the main thread */
- if (waiting_for_threads) {
- dprintf(("main thread is waiting\n"));
- if (usunsetlock(wait_lock) < 0)
- perror("usunsetlock (wait_lock)");
- }
- #ifndef NO_EXIT_PROG
- else if (do_exit)
- (void) kill(my_pid, SIGUSR1);
- #endif /* NO_EXIT_PROG */
- if (usunsetlock(count_lock) < 0)
- perror("usunsetlock (count_lock)");
- _exit(0);
- }
-
- 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);
- do_exit = 1;
- exit_status = status;
- do_exit_thread(no_cleanup);
- }
-
- 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()
- {
- ulock_t lock;
-
- dprintf(("allocate_lock called\n"));
- if (!initialized)
- init_thread();
-
- if ((lock = usnewlock(shared_arena)) == NULL)
- perror("usnewlock");
- (void) usinitlock(lock);
- 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));
- usfreelock((ulock_t) lock, shared_arena);
- }
-
- int acquire_lock _P2(lock, type_lock lock, waitflag, int waitflag)
- {
- int success;
-
- dprintf(("acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
- errno = 0; /* clear it just in case */
- if (waitflag)
- success = ussetlock((ulock_t) lock);
- else
- success = uscsetlock((ulock_t) lock, 1); /* Try it once */
- if (success < 0)
- perror(waitflag ? "ussetlock" : "uscsetlock");
- 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));
- if (usunsetlock((ulock_t) lock) < 0)
- perror("usunsetlock");
- }
-
- /*
- * Semaphore support.
- */
- type_sema allocate_sema _P1(value, int value)
- {
- usema_t *sema;
- dprintf(("allocate_sema called\n"));
- if (!initialized)
- init_thread();
-
- if ((sema = usnewsema(shared_arena, value)) == NULL)
- perror("usnewsema");
- 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));
- usfreesema((usema_t *) sema, shared_arena);
- }
-
- void down_sema _P1(sema, type_sema sema)
- {
- dprintf(("down_sema(%lx) called\n", (long) sema));
- if (uspsema((usema_t *) sema) < 0)
- perror("uspsema");
- dprintf(("down_sema(%lx) return\n", (long) sema));
- }
-
- void up_sema _P1(sema, type_sema sema)
- {
- dprintf(("up_sema(%lx)\n", (long) sema));
- if (usvsema((usema_t *) sema) < 0)
- perror("usvsema");
- }
-