390x/css: introduce maximum data address checking

[qemu.git] / util / qemu-thread-posix.c

diff --git a/util/qemu-thread-posix.c b/util/qemu-thread-posix.c
index d20cddec0cd74e127a526e1dfc0120fd5cdac261..73064758999f3bfd45819d92f4f682bf33718495 100644 (file)
--- a/util/qemu-thread-posix.c
+++ b/util/qemu-thread-posix.c
@@ -11,13 +11,10 @@
  *
  */
 #include "qemu/osdep.h"
-#ifdef __linux__
-#include <sys/syscall.h>
-#include <linux/futex.h>
-#endif
 #include "qemu/thread.h"
 #include "qemu/atomic.h"
 #include "qemu/notify.h"
+#include "trace.h"
 
 static bool name_threads;
 
@@ -46,12 +43,15 @@ void qemu_mutex_init(QemuMutex *mutex)
     err = pthread_mutex_init(&mutex->lock, NULL);
     if (err)
         error_exit(err, __func__);
+    mutex->initialized = true;
 }
 
 void qemu_mutex_destroy(QemuMutex *mutex)
 {
     int err;
 
+    assert(mutex->initialized);
+    mutex->initialized = false;
     err = pthread_mutex_destroy(&mutex->lock);
     if (err)
         error_exit(err, __func__);
@@ -61,20 +61,36 @@ void qemu_mutex_lock(QemuMutex *mutex)
 {
     int err;
 
+    assert(mutex->initialized);
     err = pthread_mutex_lock(&mutex->lock);
     if (err)
         error_exit(err, __func__);
+
+    trace_qemu_mutex_locked(mutex);
 }
 
 int qemu_mutex_trylock(QemuMutex *mutex)
 {
-    return pthread_mutex_trylock(&mutex->lock);
+    int err;
+
+    assert(mutex->initialized);
+    err = pthread_mutex_trylock(&mutex->lock);
+    if (err == 0) {
+        trace_qemu_mutex_locked(mutex);
+        return 0;
+    }
+    if (err != EBUSY) {
+        error_exit(err, __func__);
+    }
+    return -EBUSY;
 }
 
 void qemu_mutex_unlock(QemuMutex *mutex)
 {
     int err;
 
+    assert(mutex->initialized);
+    trace_qemu_mutex_unlocked(mutex);
     err = pthread_mutex_unlock(&mutex->lock);
     if (err)
         error_exit(err, __func__);
@@ -92,6 +108,7 @@ void qemu_rec_mutex_init(QemuRecMutex *mutex)
     if (err) {
         error_exit(err, __func__);
     }
+    mutex->initialized = true;
 }
 
 void qemu_cond_init(QemuCond *cond)
@@ -101,12 +118,15 @@ void qemu_cond_init(QemuCond *cond)
     err = pthread_cond_init(&cond->cond, NULL);
     if (err)
         error_exit(err, __func__);
+    cond->initialized = true;
 }
 
 void qemu_cond_destroy(QemuCond *cond)
 {
     int err;
 
+    assert(cond->initialized);
+    cond->initialized = false;
     err = pthread_cond_destroy(&cond->cond);
     if (err)
         error_exit(err, __func__);
@@ -116,6 +136,7 @@ void qemu_cond_signal(QemuCond *cond)
 {
     int err;
 
+    assert(cond->initialized);
     err = pthread_cond_signal(&cond->cond);
     if (err)
         error_exit(err, __func__);
@@ -125,6 +146,7 @@ void qemu_cond_broadcast(QemuCond *cond)
 {
     int err;
 
+    assert(cond->initialized);
     err = pthread_cond_broadcast(&cond->cond);
     if (err)
         error_exit(err, __func__);
@@ -134,7 +156,10 @@ void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex)
 {
     int err;
 
+    assert(cond->initialized);
+    trace_qemu_mutex_unlocked(mutex);
     err = pthread_cond_wait(&cond->cond, &mutex->lock);
+    trace_qemu_mutex_locked(mutex);
     if (err)
         error_exit(err, __func__);
 }
@@ -143,7 +168,7 @@ void qemu_sem_init(QemuSemaphore *sem, int init)
 {
     int rc;
 
-#if defined(__APPLE__) || defined(__NetBSD__)
+#ifndef CONFIG_SEM_TIMEDWAIT
     rc = pthread_mutex_init(&sem->lock, NULL);
     if (rc != 0) {
         error_exit(rc, __func__);
@@ -162,13 +187,16 @@ void qemu_sem_init(QemuSemaphore *sem, int init)
         error_exit(errno, __func__);
     }
 #endif
+    sem->initialized = true;
 }
 
 void qemu_sem_destroy(QemuSemaphore *sem)
 {
     int rc;
 
-#if defined(__APPLE__) || defined(__NetBSD__)
+    assert(sem->initialized);
+    sem->initialized = false;
+#ifndef CONFIG_SEM_TIMEDWAIT
     rc = pthread_cond_destroy(&sem->cond);
     if (rc < 0) {
         error_exit(rc, __func__);
@@ -189,7 +217,8 @@ void qemu_sem_post(QemuSemaphore *sem)
 {
     int rc;
 
-#if defined(__APPLE__) || defined(__NetBSD__)
+    assert(sem->initialized);
+#ifndef CONFIG_SEM_TIMEDWAIT
     pthread_mutex_lock(&sem->lock);
     if (sem->count == UINT_MAX) {
         rc = EINVAL;
@@ -226,7 +255,8 @@ int qemu_sem_timedwait(QemuSemaphore *sem, int ms)
     int rc;
     struct timespec ts;
 
-#if defined(__APPLE__) || defined(__NetBSD__)
+    assert(sem->initialized);
+#ifndef CONFIG_SEM_TIMEDWAIT
     rc = 0;
     compute_abs_deadline(&ts, ms);
     pthread_mutex_lock(&sem->lock);
@@ -273,7 +303,8 @@ void qemu_sem_wait(QemuSemaphore *sem)
 {
     int rc;
 
-#if defined(__APPLE__) || defined(__NetBSD__)
+    assert(sem->initialized);
+#ifndef CONFIG_SEM_TIMEDWAIT
     pthread_mutex_lock(&sem->lock);
     while (sem->count == 0) {
         rc = pthread_cond_wait(&sem->cond, &sem->lock);
@@ -294,29 +325,11 @@ void qemu_sem_wait(QemuSemaphore *sem)
 }
 
 #ifdef __linux__
-#define futex(...)              syscall(__NR_futex, __VA_ARGS__)
-
-static inline void futex_wake(QemuEvent *ev, int n)
-{
-    futex(ev, FUTEX_WAKE, n, NULL, NULL, 0);
-}
-
-static inline void futex_wait(QemuEvent *ev, unsigned val)
-{
-    while (futex(ev, FUTEX_WAIT, (int) val, NULL, NULL, 0)) {
-        switch (errno) {
-        case EWOULDBLOCK:
-            return;
-        case EINTR:
-            break; /* get out of switch and retry */
-        default:
-            abort();
-        }
-    }
-}
+#include "qemu/futex.h"
 #else
-static inline void futex_wake(QemuEvent *ev, int n)
+static inline void qemu_futex_wake(QemuEvent *ev, int n)
 {
+    assert(ev->initialized);
     pthread_mutex_lock(&ev->lock);
     if (n == 1) {
         pthread_cond_signal(&ev->cond);
@@ -326,8 +339,9 @@ static inline void futex_wake(QemuEvent *ev, int n)
     pthread_mutex_unlock(&ev->lock);
 }
 
-static inline void futex_wait(QemuEvent *ev, unsigned val)
+static inline void qemu_futex_wait(QemuEvent *ev, unsigned val)
 {
+    assert(ev->initialized);
     pthread_mutex_lock(&ev->lock);
     if (ev->value == val) {
         pthread_cond_wait(&ev->cond, &ev->lock);
@@ -338,7 +352,7 @@ static inline void futex_wait(QemuEvent *ev, unsigned val)
 
 /* Valid transitions:
  * - free->set, when setting the event
- * - busy->set, when setting the event, followed by futex_wake
+ * - busy->set, when setting the event, followed by qemu_futex_wake
  * - set->free, when resetting the event
  * - free->busy, when waiting
  *
@@ -362,10 +376,13 @@ void qemu_event_init(QemuEvent *ev, bool init)
 #endif
 
     ev->value = (init ? EV_SET : EV_FREE);
+    ev->initialized = true;
 }
 
 void qemu_event_destroy(QemuEvent *ev)
 {
+    assert(ev->initialized);
+    ev->initialized = false;
 #ifndef __linux__
     pthread_mutex_destroy(&ev->lock);
     pthread_cond_destroy(&ev->cond);
@@ -377,11 +394,12 @@ void qemu_event_set(QemuEvent *ev)
     /* qemu_event_set has release semantics, but because it *loads*
      * ev->value we need a full memory barrier here.
      */
+    assert(ev->initialized);
     smp_mb();
     if (atomic_read(&ev->value) != EV_SET) {
         if (atomic_xchg(&ev->value, EV_SET) == EV_BUSY) {
             /* There were waiters, wake them up.  */
-            futex_wake(ev, INT_MAX);
+            qemu_futex_wake(ev, INT_MAX);
         }
     }
 }
@@ -390,6 +408,7 @@ void qemu_event_reset(QemuEvent *ev)
 {
     unsigned value;
 
+    assert(ev->initialized);
     value = atomic_read(&ev->value);
     smp_mb_acquire();
     if (value == EV_SET) {
@@ -405,6 +424,7 @@ void qemu_event_wait(QemuEvent *ev)
 {
     unsigned value;
 
+    assert(ev->initialized);
     value = atomic_read(&ev->value);
     smp_mb_acquire();
     if (value != EV_SET) {
@@ -419,7 +439,7 @@ void qemu_event_wait(QemuEvent *ev)
                 return;
             }
         }
-        futex_wait(ev, EV_BUSY);
+        qemu_futex_wait(ev, EV_BUSY);
     }
 }
 
@@ -481,12 +501,6 @@ void qemu_thread_create(QemuThread *thread, const char *name,
     if (err) {
         error_exit(err, __func__);
     }
-    if (mode == QEMU_THREAD_DETACHED) {
-        err = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
-        if (err) {
-            error_exit(err, __func__);
-        }
-    }
 
     /* Leave signal handling to the iothread.  */
     sigfillset(&set);
@@ -499,6 +513,12 @@ void qemu_thread_create(QemuThread *thread, const char *name,
         qemu_thread_set_name(thread, name);
     }
 
+    if (mode == QEMU_THREAD_DETACHED) {
+        err = pthread_detach(thread->thread);
+        if (err) {
+            error_exit(err, __func__);
+        }
+    }
     pthread_sigmask(SIG_SETMASK, &oldset, NULL);
 
     pthread_attr_destroy(&attr);