/*
* Empire - A multi-player, client/server Internet based war game.
- * Copyright (C) 1986-2005, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ * Copyright (C) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure
*
* This program is free software; you can redistribute it and/or modify
*
* ---
*
- * See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
- * related information and legal notices. It is expected that any future
- * projects/authors will amend these files as needed.
+ * See files README, COPYING and CREDITS in the root of the source
+ * tree for related information and legal notices. It is expected
+ * that future projects/authors will amend these files as needed.
*
* ---
*
* pthread.c: Interface from Empire threads to POSIX threads
- *
+ *
* Known contributors to this file:
* Sasha Mikheev
* Steve McClure, 1998
+ * Markus Armbruster, 2005-2007
+ * Ron Koenderink, 2007
*/
+/* Required for PTHREAD_STACK_MIN on some systems, e.g. Solaris: */
+#define _XOPEN_SOURCE 500
+
+#include <config.h>
+
+#include <errno.h>
+#include <limits.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdarg.h>
#include <stdio.h>
-#if !defined(_WIN32)
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
-#endif
-#include <sys/types.h>
-#include <signal.h>
-#include <errno.h>
-#include <string.h>
-#include <limits.h>
#include "misc.h"
#include "empthread.h"
#include "prototypes.h"
-#include <stdarg.h>
+#define EMPTH_KILLED 1
+#define EMPTH_INTR 2
-#ifdef _EMPTH_POSIX
+struct empth_t {
+ char *name; /* thread name */
+ void *ud; /* user data */
+ int state; /* my state */
+ void (*ep)(void *); /* entry point */
+ pthread_t id; /* thread id */
+};
+
+struct empth_rwlock_t {
+ char *name;
+ pthread_rwlock_t lock;
+};
+
+/* Thread-specific data key */
static pthread_key_t ctx_key;
+
+/* Flags that were passed to empth_init() */
static int empth_flags;
-static void **udata; /* pointer to out global context */
-static pthread_mutex_t mtx_ctxsw; /* thread in critical section */
+/* Pointer to thread context variable */
+static void **udata;
-static void empth_status(char *format, ...) ATTRIBUTE((format (printf, 1, 2)));
+/*
+ * Non-preemption mutex.
+ * Empire code outside this file is only executed while holding this
+ * mutex. This makes sure Empire code is never preempted by Empire
+ * code.
+ */
+static pthread_mutex_t mtx_ctxsw;
+static void empth_status(char *format, ...)
+ ATTRIBUTE((format (printf, 1, 2)));
+static void empth_alarm(int sig);
static void *
-empth_start(void *ctx)
+empth_start(void *arg)
{
- struct sigaction act;
+ empth_t *ctx = arg;
- /* actually it should inherit all this from main but... */
- sigemptyset(&act.sa_mask);
- act.sa_handler = shutdwn;
- sigaction(SIGTERM, &act, NULL);
- sigaction(SIGINT, &act, NULL);
- act.sa_handler = panic;
- sigaction(SIGBUS, &act, NULL);
- sigaction(SIGSEGV, &act, NULL);
- sigaction(SIGILL, &act, NULL);
- sigaction(SIGFPE, &act, NULL);
- act.sa_handler = SIG_IGN;
- sigaction(SIGPIPE, &act, NULL);
-
- act.sa_handler = empth_alarm;
- sigaction(SIGALRM, &act, NULL);
-
- ((empth_t *)ctx)->id = pthread_self();
+ ctx->id = pthread_self();
pthread_setspecific(ctx_key, ctx);
pthread_mutex_lock(&mtx_ctxsw);
- *udata = ((empth_t *)ctx)->ud;
- ((empth_t *)ctx)->ep(((empth_t *)ctx)->ud);
+ *udata = ctx->ud;
+ ctx->ep(ctx->ud);
empth_exit();
return NULL;
}
empth_init(void **ctx_ptr, int flags)
{
empth_t *ctx;
+ sigset_t set;
struct sigaction act;
+ empth_flags = flags;
+ udata = ctx_ptr;
- pthread_key_create(&ctx_key, 0);
-#ifdef _DECTHREADS_
- pthread_mutex_init(&mtx_ctxsw, pthread_mutexattr_default);
-#else
- pthread_mutex_init(&mtx_ctxsw, 0);
-#endif
-
+ empth_init_signals();
+ sigemptyset(&set);
+ sigaddset(&set, SIGHUP);
+ sigaddset(&set, SIGINT);
+ sigaddset(&set, SIGTERM);
+ pthread_sigmask(SIG_BLOCK, &set, NULL);
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
act.sa_handler = empth_alarm;
sigaction(SIGALRM, &act, NULL);
- udata = ctx_ptr;
+ pthread_key_create(&ctx_key, NULL);
+ pthread_mutex_init(&mtx_ctxsw, NULL);
+
ctx = malloc(sizeof(empth_t));
if (!ctx) {
logerror("pthread init failed: not enough memory");
exit(1);
}
ctx->name = "Main";
- ctx->desc = "empire main";
ctx->ep = 0;
ctx->ud = 0;
ctx->id = pthread_self();
ctx->state = 0;
pthread_setspecific(ctx_key, ctx);
pthread_mutex_lock(&mtx_ctxsw);
- empth_flags = flags;
logerror("pthreads initialized");
return 0;
}
-/*
- * prio can be used for setting scheeduling policy but...
- * it seems to be optional in POSIX threads and Solaris
- * for example just ignores it.
- * More then that priority is not needed even in lwp threads.
- */
empth_t *
-empth_create(int prio, void (*entry)(void *), int size, int flags,
- char *name, char *desc, void *ud)
+empth_create(void (*entry)(void *), int size, int flags,
+ char *name, void *ud)
{
pthread_t t;
pthread_attr_t attr;
empth_t *ctx;
int eno;
- empth_status("creating new thread %s:%s", name, desc);
+ empth_status("creating new thread %s", name);
ctx = malloc(sizeof(empth_t));
if (!ctx) {
- logerror("not enough memory to create thread: %s (%s)", name,
- desc);
+ logerror("not enough memory to create thread %s", name);
return NULL;
}
ctx->name = strdup(name);
- ctx->desc = strdup(desc);
ctx->ud = ud;
ctx->state = 0;
ctx->ep = entry;
-#ifdef _DECTHREADS_
- eno = pthread_attr_init(&attr) ? errno : 0;
-#else
eno = pthread_attr_init(&attr);
-#endif
if (eno) {
- logerror("can not create thread attribute %s (%s): %s", name, desc,
- strerror(eno));
+ logerror("can not create thread attribute %s: %s",
+ name, strerror(eno));
goto bad;
}
-#if defined(__linux__)
- /* Linux doesn't let you adjust the stack */
-#elif defined(_DECTHREADS_)
- /* DEC does not have PTHREAD_STACK_MIN constant */
- /* Do not go below default size */
- if (size > pthread_attr_getstacksize(attr))
- pthread_attr_setstacksize(&attr, size);
-#else
if (size < PTHREAD_STACK_MIN)
- size = PTHREAD_STACK_MIN + 1;
-
+ size = PTHREAD_STACK_MIN;
pthread_attr_setstacksize(&attr, size);
-#endif
-
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
-#ifdef _DECTHREADS_
- eno = pthread_create(&t, attr, empth_start, ctx) ? errno : 0;
-#else
eno = pthread_create(&t, &attr, empth_start, ctx);
-#endif
if (eno) {
- logerror("can not create thread: %s (%s): %s", name, desc,
- strerror(eno));
+ logerror("can not create thread: %s: %s", name, strerror(eno));
goto bad;
}
empth_status("new thread id is %ld", (long)t);
+ empth_yield();
return ctx;
- pthread_attr_destroy(&attr);
+
bad:
pthread_attr_destroy(&attr);
free(ctx);
{
empth_t *ctx_ptr;
-#ifdef _DECTHREADS_
- pthread_getspecific(ctx_key, (pthread_addr_t *) & ctx_ptr);
-#else
- ctx_ptr = (empth_t *)pthread_getspecific(ctx_key);
-#endif
+ ctx_ptr = pthread_getspecific(ctx_key);
*udata = ctx_ptr->ud;
if (ctx_ptr->state == EMPTH_KILLED) {
empth_status("i am dead");
empth_exit();
}
+ ctx_ptr->state = 0;
empth_status("context restored");
}
empth_t *
empth_self(void)
{
-#ifdef _DECTHREADS_
- empth_t *ctx_ptr;
+ return pthread_getspecific(ctx_key);
+}
- pthread_getspecific(ctx_key, (pthread_addr_t *) & ctx_ptr);
- return ctx_ptr;
-#else
- return (empth_t *)pthread_getspecific(ctx_key);
-#endif
+char *
+empth_name(empth_t *thread)
+{
+ return thread->name;
+}
+
+void
+empth_set_name(empth_t *thread, char *name)
+{
+ if (thread->name)
+ free(thread->name);
+ thread->name = strdup(name);
}
void
empth_exit(void)
{
- empth_t *ctx_ptr;
+ empth_t *ctx = pthread_getspecific(ctx_key);
- pthread_mutex_unlock(&mtx_ctxsw);
empth_status("empth_exit");
-#ifdef _DECTHREADS_
- pthread_getspecific(ctx_key, (pthread_addr_t *) & ctx_ptr);
-#else
- ctx_ptr = (empth_t *)pthread_getspecific(ctx_key);
-#endif
- /* We want to leave the main thread around forever, until it's time
- for it to die for real (in a shutdown) */
- if (!strcmp(ctx_ptr->name, "Main")) {
- while (1) {
-#ifdef _DECTHREADS_
- pthread_yield();
-#endif
- sleep(60);
- }
- }
-
- free(ctx_ptr);
+ pthread_mutex_unlock(&mtx_ctxsw);
+ free(ctx->name);
+ free(ctx);
pthread_exit(0);
}
empth_yield(void)
{
pthread_mutex_unlock(&mtx_ctxsw);
- sleep(10); /* take a nap pthread_yield(); */
pthread_mutex_lock(&mtx_ctxsw);
empth_restorectx();
}
void
empth_terminate(empth_t *a)
{
- /* logerror("calling non supported function empth_terminate: %s:%d",
- __FILE__, __LINE__); */
empth_status("killing thread %s", a->name);
a->state = EMPTH_KILLED;
-#ifndef _DECTHREADS_
- /* DEC and OSX do not have pthread_kill. Not sure that cancel is correct. */
-#if (!defined __ppc__)
pthread_kill(a->id, SIGALRM);
-#endif
-#endif
- return;
}
void
done:
pthread_mutex_lock(&mtx_ctxsw);
empth_restorectx();
-
}
-
-void
+static void
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);
+ /*
+ * Nothing to do --- we handle this signal just to let
+ * empth_wakeup() and empth_terminate() interrupt system calls.
+ */
}
void
empth_wakeup(empth_t *a)
{
empth_status("waking up thread %s", a->name);
-#ifndef _DECTHREADS_
-#if (!defined __ppc__)
+ if (a->state == 0)
+ a->state = EMPTH_INTR;
pthread_kill(a->id, SIGALRM);
-#endif
-#endif
- empth_status("waiting for it to run");
- /* empth_yield(); */
}
-void
+int
empth_sleep(time_t until)
{
+ empth_t *ctx = pthread_getspecific(ctx_key);
struct timeval tv;
+ int res;
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);
+ tv.tv_sec = until - time(NULL);
+ tv.tv_usec = 0;
+ res = select(0, NULL, NULL, NULL, &tv);
+ } while (res < 0 && ctx->state == 0);
empth_status("sleep done. Waiting for lock");
pthread_mutex_lock(&mtx_ctxsw);
empth_restorectx();
+ return res;
}
+int
+empth_wait_for_signal(void)
+{
+ sigset_t set;
+ int sig, err;
+
+ sigemptyset(&set);
+ sigaddset(&set, SIGHUP);
+ sigaddset(&set, SIGINT);
+ sigaddset(&set, SIGTERM);
+ pthread_mutex_unlock(&mtx_ctxsw);
+ for (;;) {
+ empth_status("waiting for signals");
+ err = sigwait(&set, &sig);
+ if (CANT_HAPPEN(err)) {
+ sleep(60);
+ continue;
+ }
+ empth_status("got awaited signal %d", sig);
+ pthread_mutex_lock(&mtx_ctxsw);
+ empth_restorectx();
+ return sig;
+ }
+}
-empth_sem_t *
-empth_sem_create(char *name, int cnt)
+empth_rwlock_t *
+empth_rwlock_create(char *name)
{
- empth_sem_t *sm;
+ empth_rwlock_t *rwlock;
+
+ rwlock = malloc(sizeof(*rwlock));
+ if (!rwlock)
+ return NULL;
- sm = malloc(sizeof(empth_sem_t));
- if (!sm) {
- logerror("out of memory at %s:%d", __FILE__, __LINE__);
+ if (pthread_rwlock_init(&rwlock->lock, NULL) != 0) {
+ free(rwlock);
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;
+
+ rwlock->name = strdup(name);
+ return rwlock;
}
void
-empth_sem_signal(empth_sem_t *sm)
+empth_rwlock_destroy(empth_rwlock_t *rwlock)
{
- 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);
+ pthread_rwlock_destroy(&rwlock->lock);
+ free(rwlock->name);
+ free(rwlock);
}
void
-empth_sem_wait(empth_sem_t *sm)
+empth_rwlock_wrlock(empth_rwlock_t *rwlock)
{
- 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);
+ pthread_mutex_unlock(&mtx_ctxsw);
+ pthread_rwlock_wrlock(&rwlock->lock);
+ pthread_mutex_lock(&mtx_ctxsw);
+ empth_restorectx();
}
-#endif
+void
+empth_rwlock_rdlock(empth_rwlock_t *rwlock)
+{
+ pthread_mutex_unlock(&mtx_ctxsw);
+ pthread_rwlock_rdlock(&rwlock->lock);
+ pthread_mutex_lock(&mtx_ctxsw);
+ empth_restorectx();
+}
+
+void
+empth_rwlock_unlock(empth_rwlock_t *rwlock)
+{
+ pthread_rwlock_unlock(&rwlock->lock);
+}
projects / empserver / blobdiff