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authorMike Frysinger <vapier@gentoo.org>2005-11-15 03:13:04 +0000
committerMike Frysinger <vapier@gentoo.org>2005-11-15 03:13:04 +0000
commita9f5aa1cc96fc2c71f19a9c3e9dcbee0e78f83ca (patch)
tree2c5d251bdfd06d0a76cec9fc507b1873b4bbbdad /libpthread/linuxthreads.old/oldsemaphore.c
parentfd6dde5a19092be5bb1990dadd5c595d2ed0b3aa (diff)
rename current stable linuxthreads to linuxthreads.old to prepare for import of latest glibc version
Diffstat (limited to 'libpthread/linuxthreads.old/oldsemaphore.c')
-rw-r--r--libpthread/linuxthreads.old/oldsemaphore.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/libpthread/linuxthreads.old/oldsemaphore.c b/libpthread/linuxthreads.old/oldsemaphore.c
new file mode 100644
index 000000000..3a3b3d186
--- /dev/null
+++ b/libpthread/linuxthreads.old/oldsemaphore.c
@@ -0,0 +1,235 @@
+/*
+ * This file contains the old semaphore code that we need to
+ * preserve for glibc-2.0 backwards compatibility. Port to glibc 2.1
+ * done by Cristian Gafton.
+ */
+
+/* Linuxthreads - a simple clone()-based implementation of Posix */
+/* threads for Linux. */
+/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
+/* */
+/* This program is free software; you can redistribute it and/or */
+/* modify it under the terms of the GNU Library General Public License */
+/* as published by the Free Software Foundation; either version 2 */
+/* of the License, or (at your option) any later version. */
+/* */
+/* This program is distributed in the hope that it will be useful, */
+/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
+/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
+/* GNU Library General Public License for more details. */
+
+/* Semaphores a la POSIX 1003.1b */
+
+#include <errno.h>
+#include "pthread.h"
+#include "internals.h"
+#include "spinlock.h"
+#include "restart.h"
+#include "queue.h"
+
+typedef struct {
+ long int sem_status;
+ int sem_spinlock;
+} old_sem_t;
+
+/* Maximum value the semaphore can have. */
+#define SEM_VALUE_MAX ((int) ((~0u) >> 1))
+
+static inline int sem_compare_and_swap(old_sem_t *sem, long oldval, long newval)
+{
+ return compare_and_swap(&sem->sem_status, oldval, newval, &sem->sem_spinlock);
+}
+
+/* The state of a semaphore is represented by a long int encoding
+ either the semaphore count if >= 0 and no thread is waiting on it,
+ or the head of the list of threads waiting for the semaphore.
+ To distinguish the two cases, we encode the semaphore count N
+ as 2N+1, so that it has the lowest bit set.
+
+ A sequence of sem_wait operations on a semaphore initialized to N
+ result in the following successive states:
+ 2N+1, 2N-1, ..., 3, 1, &first_waiting_thread, &second_waiting_thread, ...
+*/
+
+static void sem_restart_list(pthread_descr waiting);
+
+int __old_sem_init(old_sem_t *sem, int pshared, unsigned int value)
+{
+ if (value > SEM_VALUE_MAX) {
+ errno = EINVAL;
+ return -1;
+ }
+ if (pshared) {
+ errno = ENOSYS;
+ return -1;
+ }
+ sem->sem_spinlock = 0;
+ sem->sem_status = ((long)value << 1) + 1;
+ return 0;
+}
+
+/* Function called by pthread_cancel to remove the thread from
+ waiting inside __old_sem_wait. Here we simply unconditionally
+ indicate that the thread is to be woken, by returning 1. */
+
+static int old_sem_extricate_func(void *obj, pthread_descr th)
+{
+ return 1;
+}
+
+int __old_sem_wait(old_sem_t * sem)
+{
+ long oldstatus, newstatus;
+ volatile pthread_descr self = thread_self();
+ pthread_descr * th;
+ pthread_extricate_if extr;
+
+ /* Set up extrication interface */
+ extr.pu_object = 0;
+ extr.pu_extricate_func = old_sem_extricate_func;
+
+ while (1) {
+ /* Register extrication interface */
+ __pthread_set_own_extricate_if(self, &extr);
+ do {
+ oldstatus = sem->sem_status;
+ if ((oldstatus & 1) && (oldstatus != 1))
+ newstatus = oldstatus - 2;
+ else {
+ newstatus = (long) self;
+ self->p_nextwaiting = (pthread_descr) oldstatus;
+ }
+ }
+ while (! sem_compare_and_swap(sem, oldstatus, newstatus));
+ if (newstatus & 1) {
+ /* We got the semaphore. */
+ __pthread_set_own_extricate_if(self, 0);
+ return 0;
+ }
+ /* Wait for sem_post or cancellation */
+ suspend(self);
+ __pthread_set_own_extricate_if(self, 0);
+
+ /* This is a cancellation point */
+ if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE) {
+ /* Remove ourselves from the waiting list if we're still on it */
+ /* First check if we're at the head of the list. */
+ do {
+ oldstatus = sem->sem_status;
+ if (oldstatus != (long) self) break;
+ newstatus = (long) self->p_nextwaiting;
+ }
+ while (! sem_compare_and_swap(sem, oldstatus, newstatus));
+ /* Now, check if we're somewhere in the list.
+ There's a race condition with sem_post here, but it does not matter:
+ the net result is that at the time pthread_exit is called,
+ self is no longer reachable from sem->sem_status. */
+ if (oldstatus != (long) self && (oldstatus & 1) == 0) {
+ for (th = &(((pthread_descr) oldstatus)->p_nextwaiting);
+ *th != NULL && *th != (pthread_descr) 1;
+ th = &((*th)->p_nextwaiting)) {
+ if (*th == self) {
+ *th = self->p_nextwaiting;
+ break;
+ }
+ }
+ }
+ pthread_exit(PTHREAD_CANCELED);
+ }
+ }
+}
+
+int __old_sem_trywait(old_sem_t * sem)
+{
+ long oldstatus, newstatus;
+
+ do {
+ oldstatus = sem->sem_status;
+ if ((oldstatus & 1) == 0 || (oldstatus == 1)) {
+ errno = EAGAIN;
+ return -1;
+ }
+ newstatus = oldstatus - 2;
+ }
+ while (! sem_compare_and_swap(sem, oldstatus, newstatus));
+ return 0;
+}
+
+int __old_sem_post(old_sem_t * sem)
+{
+ long oldstatus, newstatus;
+
+ do {
+ oldstatus = sem->sem_status;
+ if ((oldstatus & 1) == 0)
+ newstatus = 3;
+ else {
+ if (oldstatus >= SEM_VALUE_MAX) {
+ /* Overflow */
+ errno = ERANGE;
+ return -1;
+ }
+ newstatus = oldstatus + 2;
+ }
+ }
+ while (! sem_compare_and_swap(sem, oldstatus, newstatus));
+ if ((oldstatus & 1) == 0)
+ sem_restart_list((pthread_descr) oldstatus);
+ return 0;
+}
+
+int __old_sem_getvalue(old_sem_t * sem, int * sval)
+{
+ long status = sem->sem_status;
+ if (status & 1)
+ *sval = (int)((unsigned long) status >> 1);
+ else
+ *sval = 0;
+ return 0;
+}
+
+int __old_sem_destroy(old_sem_t * sem)
+{
+ if ((sem->sem_status & 1) == 0) {
+ errno = EBUSY;
+ return -1;
+ }
+ return 0;
+}
+
+/* Auxiliary function for restarting all threads on a waiting list,
+ in priority order. */
+
+static void sem_restart_list(pthread_descr waiting)
+{
+ pthread_descr th, towake, *p;
+
+ /* Sort list of waiting threads by decreasing priority (insertion sort) */
+ towake = NULL;
+ while (waiting != (pthread_descr) 1) {
+ th = waiting;
+ waiting = waiting->p_nextwaiting;
+ p = &towake;
+ while (*p != NULL && th->p_priority < (*p)->p_priority)
+ p = &((*p)->p_nextwaiting);
+ th->p_nextwaiting = *p;
+ *p = th;
+ }
+ /* Wake up threads in priority order */
+ while (towake != NULL) {
+ th = towake;
+ towake = towake->p_nextwaiting;
+ th->p_nextwaiting = NULL;
+ restart(th);
+ }
+}
+
+#if defined __PIC__ && defined DO_VERSIONING
+symbol_version (__old_sem_init, sem_init, GLIBC_2.0);
+symbol_version (__old_sem_wait, sem_wait, GLIBC_2.0);
+symbol_version (__old_sem_trywait, sem_trywait, GLIBC_2.0);
+symbol_version (__old_sem_post, sem_post, GLIBC_2.0);
+symbol_version (__old_sem_getvalue, sem_getvalue, GLIBC_2.0);
+symbol_version (__old_sem_destroy, sem_destroy, GLIBC_2.0);
+#endif
+