From 18301dfca56ba8545549e80f84423d83a46c6b64 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 2 Oct 2007 20:26:08 +0000
Subject: a lot of minor cleanups

git-svn-id: file:///home/lennart/svn/public/libsydney/trunk@36 9ba3c220-e4d3-45a2-8aa3-73fcc9aff6ce
---
 src/thread-posix.c | 215 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 215 insertions(+)
 create mode 100644 src/thread-posix.c

(limited to 'src/thread-posix.c')

diff --git a/src/thread-posix.c b/src/thread-posix.c
new file mode 100644
index 0000000..d76e8d5
--- /dev/null
+++ b/src/thread-posix.c
@@ -0,0 +1,215 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <pthread.h>
+#include <sched.h>
+#include <errno.h>
+
+#include "malloc.h"
+#include "mutex.h"
+#include "macro.h"
+#include "thread.h"
+
+struct sa_thread {
+    pthread_t id;
+    sa_thread_func_t thread_func;
+    void *userdata;
+    int running;
+    sa_mutex *mutex;
+};
+
+struct sa_tls {
+    pthread_key_t key;
+};
+
+static pthread_once_t tid_once = PTHREAD_ONCE_INIT;
+static sa_tls *tid_tls = NULL;
+
+static void tid_free_cb(void *p) {
+    sa_thread *t = p;
+
+    sa_assert(t);
+
+    if (!t->thread_func) {
+        /* This is a foreign thread, we need to free the struct */
+        sa_mutex_free(t->mutex);
+        sa_free(t);
+    }
+}
+
+static void tid_init(void) {
+    tid_tls = sa_tls_new(tid_free_cb);
+}
+
+static void* internal_thread_func(void *userdata) {
+    sa_thread *t = userdata;
+    sa_assert(t);
+
+    t->id = pthread_self();
+    sa_tls_set(tid_tls, t);
+
+    sa_mutex_lock(t->mutex);
+    t->running++;
+    sa_mutex_unlock(t->mutex);
+
+    t->thread_func(t->userdata);
+
+    sa_mutex_lock(t->mutex);
+    t->running -= 2;
+    sa_mutex_unlock(t->mutex);
+
+    return NULL;
+}
+
+sa_thread* sa_thread_new(sa_thread_func_t thread_func, void *userdata) {
+    sa_thread *t;
+
+    sa_assert(thread_func);
+
+    pthread_once(&tid_once, tid_init);
+
+    if (!tid_tls)
+        return NULL;
+
+    if (!(t = sa_new(sa_thread, 1)))
+        return NULL;
+
+    t->thread_func = thread_func;
+    t->userdata = userdata;
+    t->running = 1;
+
+    if (!(t->mutex = sa_mutex_new(FALSE, FALSE))) {
+        sa_free(t);
+        return NULL;
+    }
+
+    if (pthread_create(&t->id, NULL, internal_thread_func, t) < 0) {
+        sa_mutex_free(t->mutex);
+        sa_free(t);
+        return NULL;
+    }
+
+    return t;
+}
+
+sa_bool_t sa_thread_is_running(sa_thread *t) {
+    sa_bool_t b;
+    sa_assert(t);
+
+    /* Unfortunately there is no way to tell whether a "foreign"
+     * thread is still running. See
+     * http://udrepper.livejournal.com/16844.html for more
+     * information */
+    sa_assert(t->thread_func);
+
+    sa_mutex_lock(t->mutex);
+    b = t->running > 0;
+    sa_mutex_unlock(t->mutex);
+
+    return b;
+}
+
+void sa_thread_free(sa_thread *t) {
+    sa_assert(t);
+
+    /* Only allowed when this is not a foreign thread */
+    sa_assert(t->thread_func);
+
+    sa_thread_join(t);
+    sa_mutex_free(t->mutex);
+    sa_free(t);
+}
+
+int sa_thread_join(sa_thread *t) {
+    sa_assert(t);
+
+    /* Only allowed when this is not a foreign thread */
+    sa_assert(t->thread_func);
+
+    return pthread_join(t->id, NULL);
+}
+
+sa_thread* sa_thread_self(void) {
+    sa_thread *t;
+
+    pthread_once(&tid_once, tid_init);
+
+    if (!tid_tls)
+        return NULL;
+
+    if ((t = sa_tls_get(tid_tls)))
+        return t;
+
+    /* This is a foreign thread, let's create a pthread structure to
+     * make sure that we can always return a sensible pointer */
+
+    if (!(t = sa_new(sa_thread, 1)))
+        return NULL;
+
+    t->id = pthread_self();
+    t->thread_func = NULL;
+    t->userdata = NULL;
+    t->running = 2;
+    t->mutex = sa_mutex_new(FALSE, FALSE);
+
+    sa_tls_set(tid_tls, t);
+
+    return t;
+}
+
+void* sa_thread_get_data(sa_thread *t) {
+    sa_assert(t);
+
+    return t->userdata;
+}
+
+void sa_thread_set_data(sa_thread *t, void *userdata) {
+    sa_assert(t);
+
+    t->userdata = userdata;
+}
+
+void sa_thread_yield(void) {
+#ifdef HAVE_PTHREAD_YIELD
+    pthread_yield();
+#else
+    sa_assert_se(sched_yield() == 0);
+#endif
+}
+
+sa_tls* sa_tls_new(sa_free_cb_t free_cb) {
+    sa_tls *t;
+
+    if (!(t = sa_new(sa_tls, 1)))
+        return NULL;
+
+    if (pthread_key_create(&t->key, free_cb) < 0) {
+        sa_free(t);
+        return NULL;
+    }
+
+    return t;
+}
+
+void sa_tls_free(sa_tls *t) {
+    sa_assert(t);
+
+    sa_assert_se(pthread_key_delete(t->key) == 0);
+    sa_free(t);
+}
+
+void *sa_tls_get(sa_tls *t) {
+    sa_assert(t);
+
+    return pthread_getspecific(t->key);
+}
+
+void *sa_tls_set(sa_tls *t, void *userdata) {
+    void *r;
+
+    sa_assert(t);
+    r = pthread_getspecific(t->key);
+    sa_assert_se(pthread_setspecific(t->key, userdata) == 0);
+    return r;
+}
-- 
cgit