Import of Empire 4.2.12
This commit is contained in:
commit
d8b7fdfae1
817 changed files with 126589 additions and 0 deletions
518
src/lib/empthread/pthread.c
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518
src/lib/empthread/pthread.c
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/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ---
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*
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* See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
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* related information and legal notices. It is expected that any future
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* projects/authors will amend these files as needed.
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*
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* ---
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*
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* pthread.c: Interface from Empire threads to POSIX threads
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*
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* Known contributors to this file:
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* Sasha Mikheev
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* Steve McClure, 1998
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*/
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#include <stdio.h>
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#if !defined(_WIN32)
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#include <sys/time.h>
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#include <unistd.h>
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#endif
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#include <sys/types.h>
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#include <signal.h>
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#include <errno.h>
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#include <string.h>
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#include "misc.h"
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#include "empthread.h"
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#include "prototypes.h"
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#include <stdarg.h>
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#ifdef _EMPTH_POSIX
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static pthread_key_t ctx_key;
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static int empth_flags;
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static char **udata; /* pointer to out global context */
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static pthread_mutex_t mtx_ctxsw; /* thread in critical section */
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#if 0
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static void empth_setctx _PROTO((void *));
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#endif
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static void empth_restorectx _PROTO(());
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void *
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empth_start(void *ctx)
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{
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struct sigaction act;
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extern emp_sig_t panic();
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extern emp_sig_t shutdwn();
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/* actually it should inherit all this from main but... */
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#ifdef SA_SIGINFO
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act.sa_flags = SA_SIGINFO;
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#endif
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sigemptyset (&act.sa_mask);
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act.sa_handler = shutdwn;
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/* pthreads on Linux use SIGUSR1 (*shrug*) so only catch it if not on
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a Linux box running POSIX threads -- STM */
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#if !(defined(__linux__) && defined(_EMPTH_POSIX))
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sigaction (SIGUSR1, &act, NULL);
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#endif
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sigaction (SIGTERM, &act, NULL);
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sigaction (SIGINT, &act, NULL);
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act.sa_handler = panic;
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sigaction (SIGBUS, &act, NULL);
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sigaction (SIGSEGV, &act, NULL);
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sigaction (SIGILL, &act, NULL);
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sigaction (SIGFPE, &act, NULL);
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act.sa_handler = SIG_IGN;
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sigaction(SIGPIPE, &act, NULL);
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act.sa_handler = empth_alarm;
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sigaction(SIGALRM, &act, NULL);
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((empth_t *)ctx)->id = pthread_self();
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pthread_setspecific(ctx_key, ctx);
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pthread_mutex_lock(&mtx_ctxsw);
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*udata = ((empth_t *)ctx)->ud;
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((empth_t *)ctx)->ep(((empth_t *)ctx)->ud);
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empth_exit();
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return NULL;
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}
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static void
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empth_status(char *format, ...)
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{
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va_list ap;
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static struct timeval startTime;
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struct timeval tv;
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char buf[1024];
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int sec, msec;
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empth_t *a;
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va_start(ap, format);
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if (empth_flags & EMPTH_PRINT) {
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if (startTime.tv_sec == 0)
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gettimeofday(&startTime, 0);
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gettimeofday(&tv, 0);
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sec = tv.tv_sec - startTime.tv_sec;
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msec = (tv.tv_usec - startTime.tv_usec) / 1000;
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if (msec < 0) {
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sec++;
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msec += 1000;
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}
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vsprintf(buf, format, ap);
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a = empth_self();
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printf("%d:%02d.%03d %17s: %s\n", sec/60, sec%60, msec/10,
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a->name,
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buf);
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}
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va_end(ap);
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}
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int
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empth_init (char **ctx_ptr, int flags)
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{
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empth_t *ctx;
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struct sigaction act;
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pthread_key_create(&ctx_key, 0);
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#ifdef _DECTHREADS_
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pthread_mutex_init(&mtx_ctxsw, pthread_mutexattr_default);
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#else
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pthread_mutex_init(&mtx_ctxsw, 0);
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#endif
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act.sa_flags = 0;
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sigemptyset (&act.sa_mask);
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act.sa_handler = empth_alarm;
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sigaction(SIGALRM, &act, NULL);
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udata = ctx_ptr;
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ctx = (empth_t *)malloc(sizeof(empth_t));
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if(!ctx) {
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logerror("pthread init failed: not enough memory");
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exit(1);
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}
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ctx->name = "Main";
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ctx->desc = "empire main";
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ctx->ep = 0;
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ctx->ud = 0;
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ctx->id = pthread_self();
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ctx->state = 0;
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pthread_setspecific(ctx_key, ctx);
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pthread_mutex_lock(&mtx_ctxsw);
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empth_flags = flags;
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logerror("pthreads initialized");
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return 0;
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}
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/*
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* prio can be used for setting scheeduling policy but...
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* it seems to be optional in POSIX threads and Solaris
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* for example just ignores it.
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* More then that priority is not needed even in lwp threads.
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*/
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empth_t *
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empth_create (int prio, void (*entry)(), int size, int flags,
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char *name, char *desc, void *ud)
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{
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pthread_t t;
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pthread_attr_t attr;
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empth_t *ctx;
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int eno;
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empth_status("creating new thread %s:%s", name, desc);
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ctx = (empth_t *)malloc(sizeof(empth_t));
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if(!ctx) {
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logerror("not enough memoty to create thread: %s (%s)", name, desc);
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return NULL;
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}
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ctx->name = strdup(name);
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ctx->desc = strdup(desc);
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ctx->ud = ud;
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ctx->state = 0;
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ctx->ep = entry;
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#ifdef _DECTHREADS_
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eno = pthread_attr_init(&attr) ? errno : 0;
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#else
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eno = pthread_attr_init(&attr);
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#endif
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if(eno) {
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logerror("can not create thread attribute %s (%s): %s", name, desc,
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strerror(eno));
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goto bad;
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}
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#if defined(__linux__)
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/* Linux doesn't let you adjust the stack */
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#elif defined(_DECTHREADS_)
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/* DEC does not have PTHREAD_STACK_MIN constant */
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/* Do not go below default size */
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if(size > pthread_attr_getstacksize(attr))
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pthread_attr_setstacksize(&attr, size);
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#else
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if(size < PTHREAD_STACK_MIN)
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size = PTHREAD_STACK_MIN + 1;
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pthread_attr_setstacksize(&attr, size);
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#endif
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pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
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#ifdef _DECTHREADS_
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eno = pthread_create(&t, attr, empth_start, (void *)ctx) ? errno : 0;
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#else
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eno = pthread_create(&t, &attr, empth_start, (void *)ctx);
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#endif
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if (eno) {
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logerror("can not create thread: %s (%s): %s", name, desc,
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strerror(eno));
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goto bad;
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}
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empth_status("new thread id is %d", t);
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return ctx;
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pthread_attr_destroy(&attr);
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bad:
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pthread_attr_destroy(&attr);
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free(ctx);
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return NULL;
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}
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#if 0
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static void
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empth_setctx(void *ct)
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{
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empth_t *ctx_ptr;
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#ifdef _DECTHREADS_
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pthread_getspecific(ctx_key, (pthread_addr_t *)&ctx_ptr);
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#else
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ctx_ptr = (empth_t *)pthread_getspecific(ctx_key);
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#endif
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ctx_ptr->ud = ct;
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*udata = ((empth_t *)ctx_ptr)->ud;
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pthread_setspecific(ctx_key, (void *)ctx_ptr);
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empth_status("context saved");
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}
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#endif
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static void
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empth_restorectx(void)
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{
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empth_t *ctx_ptr;
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#ifdef _DECTHREADS_
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pthread_getspecific(ctx_key, (pthread_addr_t *)&ctx_ptr);
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#else
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ctx_ptr = (empth_t *)pthread_getspecific(ctx_key);
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#endif
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*udata = (char *)ctx_ptr->ud;
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if (ctx_ptr->state == EMPTH_KILLED) {
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empth_status("i am dead");
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empth_exit();
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}
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empth_status("context restored");
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}
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empth_t *
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empth_self(void)
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{
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#ifdef _DECTHREADS_
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empth_t *ctx_ptr;
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pthread_getspecific(ctx_key, (pthread_addr_t *)&ctx_ptr);
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return ctx_ptr;
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#else
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return (empth_t *)pthread_getspecific(ctx_key);
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#endif
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}
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void
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empth_exit (void)
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{
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empth_t *ctx_ptr;
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pthread_mutex_unlock(&mtx_ctxsw);
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empth_status("empth_exit");
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#ifdef _DECTHREADS_
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pthread_getspecific(ctx_key, (pthread_addr_t *)&ctx_ptr);
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#else
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ctx_ptr = (empth_t *)pthread_getspecific(ctx_key);
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#endif
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/* We want to leave the main thread around forever, until it's time
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for it to die for real (in a shutdown) */
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if (!strcmp(ctx_ptr->name, "Main")) {
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while(1) {
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#ifdef _DECTHREADS_
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pthread_yield();
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#endif
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sleep(60);
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||||
}
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||||
}
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free(ctx_ptr);
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pthread_exit(0);
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||||
}
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||||
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void
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||||
empth_yield (void)
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||||
{
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||||
pthread_mutex_unlock(&mtx_ctxsw);
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sleep(10); /* take a nap pthread_yield(); */
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pthread_mutex_lock(&mtx_ctxsw);
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empth_restorectx();
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||||
}
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||||
|
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void
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empth_terminate(empth_t *a)
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||||
{
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||||
/* logerror("calling non supported function empth_terminate: %s:%d",
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||||
__FILE__, __LINE__); */
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empth_status("killing thread %s", a->name);
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a->state = EMPTH_KILLED;
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#ifndef _DECTHREADS_
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/* DEC and OSX do not have pthread_kill. Not sure that cancel is correct. */
|
||||
#if (!defined __ppc__)
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||||
pthread_kill(a->id, SIGALRM);
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||||
#endif
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||||
#endif
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||||
return;
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||||
}
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void
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empth_select(int fd, int flags)
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{
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||||
fd_set readmask;
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fd_set writemask;
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struct timeval tv;
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||||
int n;
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||||
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pthread_mutex_unlock(&mtx_ctxsw);
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empth_status("%s select on %d",
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flags == EMPTH_FD_READ ? "read" : "write", fd );
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while (1) {
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tv.tv_sec = 1000000;
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tv.tv_usec = 0;
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||||
|
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FD_ZERO(&readmask);
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FD_ZERO(&writemask);
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switch(flags) {
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case EMPTH_FD_READ:
|
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FD_SET(fd, &readmask);
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break;
|
||||
case EMPTH_FD_WRITE:
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FD_SET(fd, &writemask);
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break;
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||||
default:
|
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logerror("bad flag %d passed to empth_select", flags);
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empth_exit();
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||||
}
|
||||
|
||||
n = select(fd + 1, &readmask, &writemask, (fd_set *)0, &tv);
|
||||
|
||||
if (n < 0) {
|
||||
if (errno == EINTR) {
|
||||
/* go handle the signal */
|
||||
empth_status("select broken by signal");
|
||||
goto done;
|
||||
return;
|
||||
}
|
||||
/* strange but we dont get EINTR on select broken by signal */
|
||||
empth_status("select failed (%s)", strerror(errno));
|
||||
goto done;
|
||||
return;
|
||||
}
|
||||
|
||||
if (flags == EMPTH_FD_READ && FD_ISSET(fd, &readmask)) {
|
||||
empth_status("input ready");
|
||||
break;
|
||||
}
|
||||
if (flags == EMPTH_FD_WRITE && FD_ISSET(fd, &writemask)) {
|
||||
empth_status("output ready");
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
done:
|
||||
pthread_mutex_lock(&mtx_ctxsw);
|
||||
empth_restorectx();
|
||||
|
||||
}
|
||||
|
||||
|
||||
emp_sig_t
|
||||
empth_alarm(int sig)
|
||||
{
|
||||
struct sigaction act;
|
||||
empth_status("got alarm signal");
|
||||
#ifdef SA_RESTART
|
||||
act.sa_flags &= ~SA_RESTART;
|
||||
#endif
|
||||
sigemptyset (&act.sa_mask);
|
||||
act.sa_handler = empth_alarm;
|
||||
sigaction(SIGALRM, &act, NULL);
|
||||
}
|
||||
|
||||
void
|
||||
empth_wakeup(empth_t *a)
|
||||
{
|
||||
empth_status("waking up thread %s", a->name);
|
||||
#ifndef _DECTHREADS_
|
||||
#if (!defined __ppc__)
|
||||
pthread_kill(a->id, SIGALRM);
|
||||
#endif
|
||||
#endif
|
||||
empth_status("waiting for it to run");
|
||||
/* empth_yield(); */
|
||||
}
|
||||
|
||||
void
|
||||
empth_sleep(long until)
|
||||
{
|
||||
struct timeval tv;
|
||||
|
||||
empth_status("going to sleep %ld sec", until - time(0));
|
||||
pthread_mutex_unlock(&mtx_ctxsw);
|
||||
tv.tv_sec = until - time(NULL);
|
||||
tv.tv_usec = 0;
|
||||
do {
|
||||
select (0, NULL, NULL, NULL, &tv);
|
||||
} while ((tv.tv_sec = until - time(NULL)) > 0);
|
||||
empth_status("sleep done. Waiting for lock");
|
||||
pthread_mutex_lock(&mtx_ctxsw);
|
||||
empth_restorectx();
|
||||
}
|
||||
|
||||
|
||||
empth_sem_t *
|
||||
empth_sem_create(char *name, int cnt)
|
||||
{
|
||||
empth_sem_t *sm;
|
||||
|
||||
sm = (empth_sem_t *)malloc(sizeof(empth_sem_t));
|
||||
if(!sm) {
|
||||
logerror("out of memory at %s:%d", __FILE__, __LINE__);
|
||||
return NULL;
|
||||
}
|
||||
strncpy(sm->name, name, sizeof(sm->name)-1);
|
||||
sm->count = cnt;
|
||||
#ifdef _DECTHREADS_
|
||||
pthread_mutex_init(&sm->mtx_update, pthread_mutexattr_default);
|
||||
pthread_mutex_init(&sm->mtx_sem, pthread_mutexattr_default);
|
||||
pthread_cond_init(&sm->cnd_sem, pthread_condattr_default);
|
||||
#else
|
||||
pthread_mutex_init(&sm->mtx_update, 0);
|
||||
pthread_mutex_init(&sm->mtx_sem, 0);
|
||||
pthread_cond_init(&sm->cnd_sem, 0);
|
||||
#endif
|
||||
return sm;
|
||||
}
|
||||
|
||||
void
|
||||
empth_sem_signal(empth_sem_t *sm)
|
||||
{
|
||||
empth_status("signal on semaphore %s:%d", sm->name, sm->count);
|
||||
pthread_mutex_lock(&sm->mtx_update);
|
||||
if(sm->count++ < 0) {
|
||||
pthread_mutex_unlock(&sm->mtx_update);
|
||||
pthread_mutex_lock(&sm->mtx_sem);
|
||||
pthread_cond_signal(&sm->cnd_sem);
|
||||
pthread_mutex_unlock(&sm->mtx_sem);
|
||||
}
|
||||
else
|
||||
pthread_mutex_unlock(&sm->mtx_update);
|
||||
}
|
||||
|
||||
void
|
||||
empth_sem_wait (empth_sem_t *sm)
|
||||
{
|
||||
empth_status("wait on semaphore %s:%d", sm->name, sm->count);
|
||||
pthread_mutex_lock(&sm->mtx_update);
|
||||
if(--sm->count < 0) {
|
||||
pthread_mutex_unlock(&sm->mtx_update);
|
||||
empth_status("blocking");
|
||||
pthread_mutex_unlock(&mtx_ctxsw);
|
||||
pthread_mutex_lock(&sm->mtx_sem);
|
||||
pthread_cond_wait(&sm->cnd_sem, &sm->mtx_sem);
|
||||
empth_status("waking up");
|
||||
pthread_mutex_unlock(&sm->mtx_sem);
|
||||
pthread_mutex_lock(&mtx_ctxsw);
|
||||
empth_restorectx();
|
||||
}
|
||||
else
|
||||
pthread_mutex_unlock(&sm->mtx_update);
|
||||
}
|
||||
|
||||
#endif
|
||||
Loading…
Add table
Add a link
Reference in a new issue