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Finish user stack support. Change locking code to be safe in situations with different priorities.

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1998-06-25 19:27  Ulrich Drepper  <drepper@cygnus.com>

	* attr.c: Finish user stack support.  Change locking code to be safe
	in situations with different priorities.
	* cancel.c: Likewise.
	* condvar.c: Likewise.
	* internals.h: Likewise.
	* join.c: Likewise.
	* manager.c: Likewise.
	* mutex.c: Likewise.
	* pthread.c: Likewise.
	* ptlongjmp.c: Likewise.
	* queue.h: Likewise.
	* rwlock.c: Likewise.
	* semaphore.c: Likewise.
	* semaphore.h: Likewise.
	* signals.c: Likewise.
	* spinlock.c: Likewise.
	* spinlock.h: Likewise.
	Patches by Xavier leroy.

1998-06-25  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/pthread/pthread.h: Make [sg]et_stacksize and
	[sg]et_stackaddr prototypes always available.

	* sysdeps/unix/sysv/linux/bits/posix_opt.h: Define
	_POSIX_THREAD_ATTR_STACKSIZE and _POSIX_THREAD_ATTR_STACKADDR.
This commit is contained in:
Ulrich Drepper
1998-06-25 19:36:00 +00:00
parent d47aac3999
commit 3387a425e6
23 changed files with 633 additions and 512 deletions
Download Patch File Download Diff File Expand all files Collapse all files

79
linuxthreads/manager.c
View File

@@ -31,15 +31,22 @@
#include "internals.h"
#include "spinlock.h"
#include "restart.h"
#include "semaphore.h"
/* Array of active threads. Entry 0 is reserved for the initial thread. */
struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX] =
{ { 0, &__pthread_initial_thread, 0}, /* All NULLs */ };
{ { LOCK_INITIALIZER, &__pthread_initial_thread, 0}, /* All NULLs */ };
/* Indicate whether at least one thread has a user-defined stack (if 1),
or if all threads have stacks supplied by LinuxThreads (if 0). */
int __pthread_nonstandard_stacks;
int __pthread_nonstandard_stacks = 0;
/* Number of active entries in __pthread_handles (used by gdb) */
volatile int __pthread_handles_num = 1;
/* Whether to use debugger additional actions for thread creation
(set to 1 by gdb) */
volatile int __pthread_threads_debug = 0;
/* Mapping from stack segment to thread descriptor. */
/* Stack segment numbers are also indices into the __pthread_handles array. */
@@ -93,12 +100,18 @@ int __pthread_manager(void *arg)
/* Set the error variable. */
__pthread_manager_thread.p_errnop = &__pthread_manager_thread.p_errno;
__pthread_manager_thread.p_h_errnop = &__pthread_manager_thread.p_h_errno;
/* Block all signals except PTHREAD_SIG_RESTART */
/* Block all signals except PTHREAD_SIG_RESTART, PTHREAD_SIG_CANCEL
and SIGTRAP */
sigfillset(&mask);
sigdelset(&mask, PTHREAD_SIG_RESTART);
sigdelset(&mask, PTHREAD_SIG_CANCEL); /* for debugging new threads */
sigdelset(&mask, SIGTRAP); /* for debugging purposes */
sigprocmask(SIG_SETMASK, &mask, NULL);
/* Raise our priority to match that of main thread */
__pthread_manager_adjust_prio(__pthread_main_thread->p_priority);
/* Synchronize debugging of the thread manager */
n = __libc_read(reqfd, (char *)&request, sizeof(request));
ASSERT(n == sizeof(request) && request.req_kind == REQ_DEBUG);
/* Enter server loop */
while(1) {
FD_ZERO(&readfds);
@@ -146,6 +159,14 @@ int __pthread_manager(void *arg)
return 0;
}
break;
case REQ_POST:
sem_post(request.req_args.post);
break;
case REQ_DEBUG:
/* Make gdb aware of new thread */
if (__pthread_threads_debug) raise(PTHREAD_SIG_CANCEL);
restart(request.req_thread);
break;
}
}
}
@@ -156,6 +177,7 @@ int __pthread_manager(void *arg)
static int pthread_start_thread(void *arg)
{
pthread_descr self = (pthread_descr) arg;
struct pthread_request request;
void * outcome;
/* Initialize special thread_self processing, if any. */
#ifdef INIT_THREAD_SELF
@@ -171,6 +193,14 @@ static int pthread_start_thread(void *arg)
if (self->p_start_args.schedpolicy >= 0)
__sched_setscheduler(self->p_pid, self->p_start_args.schedpolicy,
&self->p_start_args.schedparam);
/* Make gdb aware of new thread */
if (__pthread_threads_debug) {
request.req_thread = self;
request.req_kind = REQ_DEBUG;
__libc_write(__pthread_manager_request,
(char *) &request, sizeof(request));
suspend(self);
}
/* Run the thread code */
outcome = self->p_start_args.start_routine(self->p_start_args.arg);
/* Exit with the given return value */
@@ -188,6 +218,7 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
char * new_thread_bottom;
pthread_t new_thread_id;
void *guardaddr = NULL;
size_t guardsize = 0;
/* Find a free stack segment for the current stack */
for (sseg = 1; ; sseg++)
@@ -211,13 +242,16 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
and allocate it if necessary. */
if (attr == NULL || attr->guardsize != 0)
{
guardsize = attr ? attr->guardsize : __getpagesize ();
guardaddr = mmap ((caddr_t)((char *)(new_thread+1)
- STACK_SIZE),
attr ? attr->guardsize : __getpagesize (),
0, MAP_FIXED, -1, 0);
guardsize, 0, MAP_FIXED, -1, 0);
if (guardaddr == MAP_FAILED)
/* We don't make this an error. */
guardaddr = NULL;
{
/* We don't make this an error. */
guardaddr = NULL;
guardsize = 0;
}
}
break;
}
@@ -238,7 +272,7 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
new_thread->p_nextwaiting = NULL;
new_thread->p_tid = new_thread_id;
new_thread->p_priority = 0;
new_thread->p_spinlock = &(__pthread_handles[sseg].h_spinlock);
new_thread->p_lock = &(__pthread_handles[sseg].h_lock);
new_thread->p_signal = 0;
new_thread->p_signal_jmp = NULL;
new_thread->p_cancel_jmp = NULL;
@@ -255,16 +289,15 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
new_thread->p_errno = 0;
new_thread->p_h_errnop = &new_thread->p_h_errno;
new_thread->p_h_errno = 0;
new_thread->p_in_sighandler = NULL;
new_thread->p_sigwaiting = 0;
new_thread->p_guardaddr = guardaddr;
new_thread->p_guardsize = (guardaddr == NULL
? 0
: (attr == NULL
? __getpagesize () : attr->guardsize));
new_thread->p_guardsize = guardsize;
new_thread->p_userstack = attr != NULL && attr->stackaddr_set;
memset (new_thread->p_specific, '\0',
PTHREAD_KEY_1STLEVEL_SIZE * sizeof (new_thread->p_specific[0]));
/* Initialize the thread handle */
__pthread_handles[sseg].h_spinlock = 0; /* should already be 0 */
__pthread_init_lock(&__pthread_handles[sseg].h_lock);
__pthread_handles[sseg].h_descr = new_thread;
__pthread_handles[sseg].h_bottom = new_thread_bottom;
/* Determine scheduling parameters for the thread */
@@ -305,6 +338,8 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
munmap(new_thread->p_guardaddr, new_thread->p_guardsize);
}
__pthread_handles[sseg].h_descr = NULL;
__pthread_handles[sseg].h_bottom = NULL;
__pthread_handles_num--;
return errno;
}
/* Insert new thread in doubly linked list of active threads */
@@ -330,10 +365,12 @@ static void pthread_free(pthread_descr th)
ASSERT(th->p_exited);
/* Make the handle invalid */
handle = thread_handle(th->p_tid);
acquire(&handle->h_spinlock);
__pthread_lock(&handle->h_lock);
handle->h_descr = NULL;
handle->h_bottom = (char *)(-1L);
release(&handle->h_spinlock);
__pthread_unlock(&handle->h_lock);
/* One fewer threads in __pthread_handles */
__pthread_handles_num--;
/* If initial thread, nothing to free */
if (th == &__pthread_initial_thread) return;
if (!th->p_userstack)
@@ -360,10 +397,10 @@ static void pthread_exited(pid_t pid)
th->p_nextlive->p_prevlive = th->p_prevlive;
th->p_prevlive->p_nextlive = th->p_nextlive;
/* Mark thread as exited, and if detached, free its resources */
acquire(th->p_spinlock);
__pthread_lock(th->p_lock);
th->p_exited = 1;
detached = th->p_detached;
release(th->p_spinlock);
__pthread_unlock(th->p_lock);
if (detached) pthread_free(th);
break;
}
@@ -409,16 +446,16 @@ static void pthread_handle_free(pthread_descr th)
} while (t != __pthread_main_thread);
if (t != th) return;
acquire(th->p_spinlock);
__pthread_lock(th->p_lock);
if (th->p_exited) {
release(th->p_spinlock);
__pthread_unlock(th->p_lock);
pthread_free(th);
} else {
/* The Unix process of the thread is still running.
Mark the thread as detached so that the thread manager will
deallocate its resources when the Unix process exits. */
th->p_detached = 1;
release(th->p_spinlock);
__pthread_unlock(th->p_lock);
}
}