mirror of https://github.com/python/cpython
440 lines
11 KiB
C
440 lines
11 KiB
C
/***********************************************************
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Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum,
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Amsterdam, The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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#ifdef WITH_SGI_DL
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#define USE_DL
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/prctl.h>
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#include <ulocks.h>
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#include <errno.h>
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#define HDR_SIZE 2680 /* sizeof(ushdr_t) */
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#define MAXPROC 100 /* max # of threads that can be started */
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static usptr_t *shared_arena;
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static ulock_t count_lock; /* protection for some variables */
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static ulock_t wait_lock; /* lock used to wait for other threads */
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static int waiting_for_threads; /* protected by count_lock */
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static int nthreads; /* protected by count_lock */
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static int exit_status;
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#ifndef NO_EXIT_PROG
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static int do_exit; /* indicates that the program is to exit */
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#endif
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static int exiting; /* we're already exiting (for maybe_exit) */
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static pid_t my_pid; /* PID of main thread */
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static struct pidlist {
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pid_t parent;
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pid_t child;
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} pidlist[MAXPROC]; /* PIDs of other threads; protected by count_lock */
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static int maxpidindex; /* # of PIDs in pidlist */
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#ifndef NO_EXIT_PROG
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/*
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* This routine is called as a signal handler when another thread
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* exits. When that happens, we must see whether we have to exit as
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* well (because of an exit_prog()) or whether we should continue on.
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*/
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static void exit_sig _P0()
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{
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d2printf(("exit_sig called\n"));
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if (exiting && getpid() == my_pid) {
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d2printf(("already exiting\n"));
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return;
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}
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if (do_exit) {
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d2printf(("exiting in exit_sig\n"));
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#ifdef DEBUG
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if ((thread_debug & 8) == 0)
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thread_debug &= ~1; /* don't produce debug messages */
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#endif
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exit_thread();
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}
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}
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/*
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* This routine is called when a process calls exit(). If that wasn't
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* done from the library, we do as if an exit_prog() was intended.
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*/
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static void maybe_exit _P0()
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{
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dprintf(("maybe_exit called\n"));
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if (exiting) {
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dprintf(("already exiting\n"));
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return;
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}
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exit_prog(0);
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}
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#endif /* NO_EXIT_PROG */
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/*
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* Initialization.
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*/
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static void _init_thread _P0()
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{
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#ifndef NO_EXIT_PROG
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struct sigaction s;
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#endif /* NO_EXIT_PROG */
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#ifdef USE_DL
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long addr, size;
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#endif /* USE_DL */
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#ifdef USE_DL
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if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
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perror("usconfig - CONF_INITSIZE (check)");
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if (usconfig(CONF_INITSIZE, size) < 0)
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perror("usconfig - CONF_INITSIZE (reset)");
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addr = (long) dl_getrange(size + HDR_SIZE);
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dprintf(("trying to use addr %lx-%lx for shared arena\n", addr, addr+size));
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errno = 0;
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if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 && errno != 0)
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perror("usconfig - CONF_ATTACHADDR (set)");
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#endif /* USE_DL */
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if (usconfig(CONF_INITUSERS, 16) < 0)
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perror("usconfig - CONF_INITUSERS");
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my_pid = getpid(); /* so that we know which is the main thread */
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#ifndef NO_EXIT_PROG
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atexit(maybe_exit);
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s.sa_handler = exit_sig;
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sigemptyset(&s.sa_mask);
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/*sigaddset(&s.sa_mask, SIGUSR1);*/
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s.sa_flags = 0;
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sigaction(SIGUSR1, &s, 0);
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if (prctl(PR_SETEXITSIG, SIGUSR1) < 0)
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perror("prctl - PR_SETEXITSIG");
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#endif /* NO_EXIT_PROG */
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if (usconfig(CONF_ARENATYPE, US_SHAREDONLY) < 0)
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perror("usconfig - CONF_ARENATYPE");
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usconfig(CONF_LOCKTYPE, US_DEBUG); /* XXX */
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#ifdef DEBUG
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if (thread_debug & 4)
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usconfig(CONF_LOCKTYPE, US_DEBUGPLUS);
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else if (thread_debug & 2)
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usconfig(CONF_LOCKTYPE, US_DEBUG);
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#endif /* DEBUG */
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if ((shared_arena = usinit(tmpnam(0))) == 0)
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perror("usinit");
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#ifdef USE_DL
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if (usconfig(CONF_ATTACHADDR, addr) < 0) /* reset address */
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perror("usconfig - CONF_ATTACHADDR (reset)");
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#endif /* USE_DL */
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if ((count_lock = usnewlock(shared_arena)) == NULL)
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perror("usnewlock (count_lock)");
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(void) usinitlock(count_lock);
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if ((wait_lock = usnewlock(shared_arena)) == NULL)
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perror("usnewlock (wait_lock)");
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dprintf(("arena start: %lx, arena size: %ld\n", (long) shared_arena, (long) usconfig(CONF_GETSIZE, shared_arena)));
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}
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/*
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* Thread support.
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*/
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static void clean_threads _P0()
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{
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int i, j;
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pid_t mypid, pid;
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/* clean up any exited threads */
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mypid = getpid();
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i = 0;
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while (i < maxpidindex) {
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if (pidlist[i].parent == mypid && (pid = pidlist[i].child) > 0) {
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pid = waitpid(pid, 0, WNOHANG);
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if (pid > 0) {
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/* a thread has exited */
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pidlist[i] = pidlist[--maxpidindex];
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/* remove references to children of dead proc */
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for (j = 0; j < maxpidindex; j++)
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if (pidlist[j].parent == pid)
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pidlist[j].child = -1;
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continue; /* don't increment i */
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}
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}
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i++;
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}
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/* clean up the list */
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i = 0;
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while (i < maxpidindex) {
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if (pidlist[i].child == -1) {
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pidlist[i] = pidlist[--maxpidindex];
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continue; /* don't increment i */
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}
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i++;
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}
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}
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int start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
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{
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#ifdef USE_DL
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long addr, size;
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static int local_initialized = 0;
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#endif /* USE_DL */
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int success = 0; /* init not needed when SOLARIS_THREADS and */
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/* C_THREADS implemented properly */
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dprintf(("start_new_thread called\n"));
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if (!initialized)
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init_thread();
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switch (ussetlock(count_lock)) {
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case 0: return 0;
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case -1: perror("ussetlock (count_lock)");
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}
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if (maxpidindex >= MAXPROC)
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success = -1;
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else {
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#ifdef USE_DL
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if (!local_initialized) {
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if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
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perror("usconfig - CONF_INITSIZE (check)");
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if (usconfig(CONF_INITSIZE, size) < 0)
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perror("usconfig - CONF_INITSIZE (reset)");
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addr = (long) dl_getrange(size + HDR_SIZE);
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dprintf(("trying to use addr %lx-%lx for sproc\n",
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addr, addr+size));
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errno = 0;
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if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 &&
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errno != 0)
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perror("usconfig - CONF_ATTACHADDR (set)");
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}
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#endif /* USE_DL */
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clean_threads();
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if ((success = sproc(func, PR_SALL, arg)) < 0)
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perror("sproc");
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#ifdef USE_DL
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if (!local_initialized) {
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if (usconfig(CONF_ATTACHADDR, addr) < 0)
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/* reset address */
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perror("usconfig - CONF_ATTACHADDR (reset)");
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local_initialized = 1;
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}
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#endif /* USE_DL */
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if (success >= 0) {
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nthreads++;
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pidlist[maxpidindex].parent = getpid();
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pidlist[maxpidindex++].child = success;
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dprintf(("pidlist[%d] = %d\n",
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maxpidindex-1, success));
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}
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}
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if (usunsetlock(count_lock) < 0)
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perror("usunsetlock (count_lock)");
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return success < 0 ? 0 : 1;
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}
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long get_thread_ident _P0()
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{
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return getpid();
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}
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static void do_exit_thread _P1(no_cleanup, int no_cleanup)
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{
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dprintf(("exit_thread called\n"));
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if (!initialized)
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if (no_cleanup)
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_exit(0);
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else
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exit(0);
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if (ussetlock(count_lock) < 0)
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perror("ussetlock (count_lock)");
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nthreads--;
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if (getpid() == my_pid) {
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/* main thread; wait for other threads to exit */
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exiting = 1;
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#ifndef NO_EXIT_PROG
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if (do_exit) {
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int i;
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/* notify other threads */
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clean_threads();
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if (nthreads >= 0) {
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dprintf(("kill other threads\n"));
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for (i = 0; i < maxpidindex; i++)
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if (pidlist[i].child > 0)
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(void) kill(pidlist[i].child,
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SIGKILL);
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_exit(exit_status);
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}
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}
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#endif /* NO_EXIT_PROG */
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waiting_for_threads = 1;
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if (ussetlock(wait_lock) < 0)
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perror("ussetlock (wait_lock)");
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for (;;) {
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if (nthreads < 0) {
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dprintf(("really exit (%d)\n", exit_status));
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if (no_cleanup)
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_exit(exit_status);
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else
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exit(exit_status);
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}
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if (usunsetlock(count_lock) < 0)
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perror("usunsetlock (count_lock)");
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dprintf(("waiting for other threads (%d)\n", nthreads));
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if (ussetlock(wait_lock) < 0)
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perror("ussetlock (wait_lock)");
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if (ussetlock(count_lock) < 0)
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perror("ussetlock (count_lock)");
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}
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}
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/* not the main thread */
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if (waiting_for_threads) {
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dprintf(("main thread is waiting\n"));
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if (usunsetlock(wait_lock) < 0)
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perror("usunsetlock (wait_lock)");
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}
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#ifndef NO_EXIT_PROG
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else if (do_exit)
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(void) kill(my_pid, SIGUSR1);
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#endif /* NO_EXIT_PROG */
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if (usunsetlock(count_lock) < 0)
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perror("usunsetlock (count_lock)");
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_exit(0);
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}
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void exit_thread _P0()
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{
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do_exit_thread(0);
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}
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void _exit_thread _P0()
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{
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do_exit_thread(1);
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}
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#ifndef NO_EXIT_PROG
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static void do_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
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{
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dprintf(("exit_prog(%d) called\n", status));
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if (!initialized)
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if (no_cleanup)
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_exit(status);
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else
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exit(status);
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do_exit = 1;
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exit_status = status;
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do_exit_thread(no_cleanup);
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}
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void exit_prog _P1(status, int status)
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{
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do_exit_prog(status, 0);
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}
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void _exit_prog _P1(status, int status)
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{
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do_exit_prog(status, 1);
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}
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#endif /* NO_EXIT_PROG */
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/*
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* Lock support.
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*/
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type_lock allocate_lock _P0()
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{
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ulock_t lock;
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dprintf(("allocate_lock called\n"));
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if (!initialized)
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init_thread();
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if ((lock = usnewlock(shared_arena)) == NULL)
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perror("usnewlock");
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(void) usinitlock(lock);
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dprintf(("allocate_lock() -> %lx\n", (long)lock));
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return (type_lock) lock;
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}
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void free_lock _P1(lock, type_lock lock)
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{
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dprintf(("free_lock(%lx) called\n", (long)lock));
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usfreelock((ulock_t) lock, shared_arena);
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}
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int acquire_lock _P2(lock, type_lock lock, waitflag, int waitflag)
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{
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int success;
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dprintf(("acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
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errno = 0; /* clear it just in case */
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if (waitflag)
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success = ussetlock((ulock_t) lock);
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else
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success = uscsetlock((ulock_t) lock, 1); /* Try it once */
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if (success < 0)
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perror(waitflag ? "ussetlock" : "uscsetlock");
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dprintf(("acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
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return success;
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}
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void release_lock _P1(lock, type_lock lock)
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{
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dprintf(("release_lock(%lx) called\n", (long)lock));
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if (usunsetlock((ulock_t) lock) < 0)
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perror("usunsetlock");
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}
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/*
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* Semaphore support.
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*/
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type_sema allocate_sema _P1(value, int value)
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{
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usema_t *sema;
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dprintf(("allocate_sema called\n"));
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if (!initialized)
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init_thread();
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if ((sema = usnewsema(shared_arena, value)) == NULL)
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perror("usnewsema");
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dprintf(("allocate_sema() -> %lx\n", (long) sema));
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return (type_sema) sema;
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}
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void free_sema _P1(sema, type_sema sema)
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{
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dprintf(("free_sema(%lx) called\n", (long) sema));
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usfreesema((usema_t *) sema, shared_arena);
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}
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void down_sema _P1(sema, type_sema sema)
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{
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dprintf(("down_sema(%lx) called\n", (long) sema));
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if (uspsema((usema_t *) sema) < 0)
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perror("uspsema");
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dprintf(("down_sema(%lx) return\n", (long) sema));
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}
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void up_sema _P1(sema, type_sema sema)
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{
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dprintf(("up_sema(%lx)\n", (long) sema));
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if (usvsema((usema_t *) sema) < 0)
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perror("usvsema");
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}
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