aboutsummaryrefslogtreecommitdiffstats
path: root/e-util/e-msgport.c
diff options
context:
space:
mode:
Diffstat (limited to 'e-util/e-msgport.c')
-rw-r--r--e-util/e-msgport.c876
1 files changed, 0 insertions, 876 deletions
diff --git a/e-util/e-msgport.c b/e-util/e-msgport.c
deleted file mode 100644
index d034f0deaf..0000000000
--- a/e-util/e-msgport.c
+++ /dev/null
@@ -1,876 +0,0 @@
-
-#include "e-msgport.h"
-
-#include <sys/time.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <stdio.h>
-
-#include <pthread.h>
-
-#include <glib.h>
-
-#define m(x) /* msgport debug */
-#define t(x) /* thread debug */
-
-void e_dlist_init(EDList *v)
-{
- v->head = (EDListNode *)&v->tail;
- v->tail = 0;
- v->tailpred = (EDListNode *)&v->head;
-}
-
-EDListNode *e_dlist_addhead(EDList *l, EDListNode *n)
-{
- n->next = l->head;
- n->prev = (EDListNode *)&l->head;
- l->head->prev = n;
- l->head = n;
- return n;
-}
-
-EDListNode *e_dlist_addtail(EDList *l, EDListNode *n)
-{
- n->next = (EDListNode *)&l->tail;
- n->prev = l->tailpred;
- l->tailpred->next = n;
- l->tailpred = n;
- return n;
-}
-
-EDListNode *e_dlist_remove(EDListNode *n)
-{
- n->next->prev = n->prev;
- n->prev->next = n->next;
- return n;
-}
-
-EDListNode *e_dlist_remhead(EDList *l)
-{
- EDListNode *n, *nn;
-
- n = l->head;
- nn = n->next;
- if (nn) {
- nn->prev = n->prev;
- l->head = nn;
- return n;
- }
- return NULL;
-}
-
-EDListNode *e_dlist_remtail(EDList *l)
-{
- EDListNode *n, *np;
-
- n = l->tailpred;
- np = n->prev;
- if (np) {
- np->next = n->next;
- l->tailpred = np;
- return n;
- }
- return NULL;
-}
-
-int e_dlist_empty(EDList *l)
-{
- return (l->head == (EDListNode *)&l->tail);
-}
-
-int e_dlist_length(EDList *l)
-{
- EDListNode *n, *nn;
- int count = 0;
-
- n = l->head;
- nn = n->next;
- while (nn) {
- count++;
- n = nn;
- nn = n->next;
- }
-
- return 0;
-}
-
-struct _EMsgPort {
- EDList queue;
- int condwait; /* how many waiting in condwait */
- union {
- int pipe[2];
- struct {
- int read;
- int write;
- } fd;
- } pipe;
- /* @#@$#$ glib stuff */
- GCond *cond;
- GMutex *lock;
-};
-
-EMsgPort *e_msgport_new(void)
-{
- EMsgPort *mp;
-
- mp = g_malloc(sizeof(*mp));
- e_dlist_init(&mp->queue);
- mp->lock = g_mutex_new();
- mp->cond = g_cond_new();
- mp->pipe.fd.read = -1;
- mp->pipe.fd.write = -1;
- mp->condwait = 0;
-
- return mp;
-}
-
-void e_msgport_destroy(EMsgPort *mp)
-{
- g_mutex_free(mp->lock);
- g_cond_free(mp->cond);
- if (mp->pipe.fd.read != -1) {
- close(mp->pipe.fd.read);
- close(mp->pipe.fd.write);
- }
- g_free(mp);
-}
-
-/* get a fd that can be used to wait on the port asynchronously */
-int e_msgport_fd(EMsgPort *mp)
-{
- int fd;
-
- g_mutex_lock(mp->lock);
- fd = mp->pipe.fd.read;
- if (fd == -1) {
- pipe(mp->pipe.pipe);
- fd = mp->pipe.fd.read;
- }
- g_mutex_unlock(mp->lock);
-
- return fd;
-}
-
-void e_msgport_put(EMsgPort *mp, EMsg *msg)
-{
- m(printf("put:\n"));
- g_mutex_lock(mp->lock);
- e_dlist_addtail(&mp->queue, &msg->ln);
- if (mp->condwait > 0) {
- m(printf("put: condwait > 0, waking up\n"));
- g_cond_signal(mp->cond);
- }
- if (mp->pipe.fd.write != -1) {
- m(printf("put: have pipe, writing notification to it\n"));
- write(mp->pipe.fd.write, "", 1);
- }
- g_mutex_unlock(mp->lock);
- m(printf("put: done\n"));
-}
-
-static void
-msgport_cleanlock(void *data)
-{
- EMsgPort *mp = data;
-
- g_mutex_unlock(mp->lock);
-}
-
-EMsg *e_msgport_wait(EMsgPort *mp)
-{
- EMsg *msg;
-
- m(printf("wait:\n"));
- g_mutex_lock(mp->lock);
- while (e_dlist_empty(&mp->queue)) {
- if (mp->pipe.fd.read == -1) {
- m(printf("wait: waiting on condition\n"));
- mp->condwait++;
- /* if we are cancelled in the cond-wait, then we need to unlock our lock when we cleanup */
- pthread_cleanup_push(msgport_cleanlock, mp);
- g_cond_wait(mp->cond, mp->lock);
- pthread_cleanup_pop(0);
- m(printf("wait: got condition\n"));
- mp->condwait--;
- } else {
- fd_set rfds;
-
- m(printf("wait: waitng on pipe\n"));
- FD_ZERO(&rfds);
- FD_SET(mp->pipe.fd.read, &rfds);
- g_mutex_unlock(mp->lock);
- select(mp->pipe.fd.read+1, &rfds, NULL, NULL, NULL);
- pthread_testcancel();
- g_mutex_lock(mp->lock);
- m(printf("wait: got pipe\n"));
- }
- }
- msg = (EMsg *)mp->queue.head;
- m(printf("wait: message = %p\n", msg));
- g_mutex_unlock(mp->lock);
- m(printf("wait: done\n"));
- return msg;
-}
-
-EMsg *e_msgport_get(EMsgPort *mp)
-{
- EMsg *msg;
- char dummy[1];
-
- g_mutex_lock(mp->lock);
- msg = (EMsg *)e_dlist_remhead(&mp->queue);
- if (msg && mp->pipe.fd.read != -1)
- read(mp->pipe.fd.read, dummy, 1);
- m(printf("get: message = %p\n", msg));
- g_mutex_unlock(mp->lock);
-
- return msg;
-}
-
-void e_msgport_reply(EMsg *msg)
-{
- if (msg->reply_port) {
- e_msgport_put(msg->reply_port, msg);
- }
- /* else lost? */
-}
-
-struct _thread_info {
- pthread_t id;
- int busy;
-};
-
-struct _EThread {
- EMsgPort *server_port;
- EMsgPort *reply_port;
- pthread_mutex_t mutex;
- e_thread_t type;
- int queue_limit;
-
- int waiting; /* if we are waiting for a new message, count of waiting processes */
- pthread_t id; /* id of our running child thread */
- GList *id_list; /* if THREAD_NEW, then a list of our child threads in thread_info structs */
-
- EThreadFunc destroy;
- void *destroy_data;
-
- EThreadFunc received;
- void *received_data;
-
- EThreadFunc lost;
- void *lost_data;
-};
-
-#define E_THREAD_NONE ((pthread_t)~0)
-
-static void thread_destroy_msg(EThread *e, EMsg *m);
-
-static struct _thread_info *thread_find(EThread *e, pthread_t id)
-{
- GList *node;
- struct _thread_info *info;
-
- node = e->id_list;
- while (node) {
- info = node->data;
- if (info->id == id)
- return info;
- node = node->next;
- }
- return NULL;
-}
-
-#if 0
-static void thread_remove(EThread *e, pthread_t id)
-{
- GList *node;
- struct _thread_info *info;
-
- node = e->id_list;
- while (node) {
- info = node->data;
- if (info->id == id) {
- e->id_list = g_list_remove(e->id_list, info);
- g_free(info);
- }
- node = node->next;
- }
-}
-#endif
-
-EThread *e_thread_new(e_thread_t type)
-{
- EThread *e;
-
- e = g_malloc0(sizeof(*e));
- pthread_mutex_init(&e->mutex, 0);
- e->type = type;
- e->server_port = e_msgport_new();
- e->id = E_THREAD_NONE;
- e->queue_limit = INT_MAX;
-
- return e;
-}
-
-/* close down the threads & resources etc */
-void e_thread_destroy(EThread *e)
-{
- int tries = 0;
- int busy = FALSE;
- EMsg *msg;
- struct _thread_info *info;
-
- /* make sure we soak up all the messages first */
- while ( (msg = e_msgport_get(e->server_port)) ) {
- thread_destroy_msg(e, msg);
- }
-
- pthread_mutex_lock(&e->mutex);
-
- switch(e->type) {
- case E_THREAD_QUEUE:
- case E_THREAD_DROP:
- /* if we have a thread, 'kill' it */
- while (e->id != E_THREAD_NONE && tries < 500) {
- if (e->waiting > 0) {
- pthread_t id = e->id;
- e->id = E_THREAD_NONE;
- pthread_mutex_unlock(&e->mutex);
- if (pthread_cancel(id) == 0)
- pthread_join(id, 0);
- pthread_mutex_lock(&e->mutex);
- } else {
- (printf("thread still active, waiting for it to finish\n"));
- pthread_mutex_unlock(&e->mutex);
- sleep(1);
- pthread_mutex_lock(&e->mutex);
- }
- tries++;
- }
- busy = e->id != E_THREAD_NONE;
- break;
- case E_THREAD_NEW:
- while (e->id_list && tries < 500) {
- info = e->id_list->data;
- if (!info->busy) {
- e->id_list = g_list_remove(e->id_list, info);
- printf("cleaning up pool thread %ld\n", info->id);
- pthread_mutex_unlock(&e->mutex);
- if (pthread_cancel(info->id) == 0)
- pthread_join(info->id, 0);
- pthread_mutex_lock(&e->mutex);
- printf("cleaned up ok\n");
- g_free(info);
- } else {
- (printf("thread(s) still active, waiting for it to finish\n"));
- tries++;
- pthread_mutex_unlock(&e->mutex);
- sleep(1);
- pthread_mutex_lock(&e->mutex);
- }
- }
-#if 0
- while (g_list_length(e->id_list) && tries < 5) {
- (printf("thread(s) still active, waiting for them to finish\n"));
- pthread_mutex_unlock(&e->mutex);
- sleep(1);
- pthread_mutex_lock(&e->mutex);
- }
-#endif
- busy = g_list_length(e->id_list) != 0;
- break;
- }
-
- pthread_mutex_unlock(&e->mutex);
-
- /* and clean up, if we can */
- if (busy) {
- g_warning("threads were busy, leaked EThread");
- return;
- }
-
- e_msgport_destroy(e->server_port);
- g_free(e);
-}
-
-/* set the queue maximum depth, what happens when the queue
- fills up depends on the queue type */
-void e_thread_set_queue_limit(EThread *e, int limit)
-{
- e->queue_limit = limit;
-}
-
-/* set a msg destroy callback, this can not call any e_thread functions on @e */
-void e_thread_set_msg_destroy(EThread *e, EThreadFunc destroy, void *data)
-{
- pthread_mutex_lock(&e->mutex);
- e->destroy = destroy;
- e->destroy_data = data;
- pthread_mutex_unlock(&e->mutex);
-}
-
-/* set a message lost callback, called if any message is discarded */
-void e_thread_set_msg_lost(EThread *e, EThreadFunc lost, void *data)
-{
- pthread_mutex_lock(&e->mutex);
- e->lost = lost;
- e->lost_data = lost;
- pthread_mutex_unlock(&e->mutex);
-}
-
-/* set a reply port, if set, then send messages back once finished */
-void e_thread_set_reply_port(EThread *e, EMsgPort *reply_port)
-{
- e->reply_port = reply_port;
-}
-
-/* set a received data callback */
-void e_thread_set_msg_received(EThread *e, EThreadFunc received, void *data)
-{
- pthread_mutex_lock(&e->mutex);
- e->received = received;
- e->received_data = data;
- pthread_mutex_unlock(&e->mutex);
-}
-
-static void
-thread_destroy_msg(EThread *e, EMsg *m)
-{
- EThreadFunc func;
- void *func_data;
-
- /* we do this so we never get an incomplete/unmatched callback + data */
- pthread_mutex_lock(&e->mutex);
- func = e->destroy;
- func_data = e->destroy_data;
- pthread_mutex_unlock(&e->mutex);
-
- if (func)
- func(e, m, func_data);
-}
-
-static void
-thread_received_msg(EThread *e, EMsg *m)
-{
- EThreadFunc func;
- void *func_data;
-
- /* we do this so we never get an incomplete/unmatched callback + data */
- pthread_mutex_lock(&e->mutex);
- func = e->received;
- func_data = e->received_data;
- pthread_mutex_unlock(&e->mutex);
-
- if (func)
- func(e, m, func_data);
- else
- g_warning("No processing callback for EThread, message unprocessed");
-}
-
-static void
-thread_lost_msg(EThread *e, EMsg *m)
-{
- EThreadFunc func;
- void *func_data;
-
- /* we do this so we never get an incomplete/unmatched callback + data */
- pthread_mutex_lock(&e->mutex);
- func = e->lost;
- func_data = e->lost_data;
- pthread_mutex_unlock(&e->mutex);
-
- if (func)
- func(e, m, func_data);
-}
-
-/* the actual thread dispatcher */
-static void *
-thread_dispatch(void *din)
-{
- EThread *e = din;
- EMsg *m;
- struct _thread_info *info;
-
- t(printf("dispatch thread started: %ld\n", pthread_self()));
-
- while (1) {
- pthread_mutex_lock(&e->mutex);
- m = e_msgport_get(e->server_port);
- if (m == NULL) {
- /* nothing to do? If we are a 'new' type thread, just quit.
- Otherwise, go into waiting (can be cancelled here) */
- info = NULL;
- switch (e->type) {
- case E_THREAD_NEW:
- case E_THREAD_QUEUE:
- case E_THREAD_DROP:
- info = thread_find(e, pthread_self());
- if (info)
- info->busy = FALSE;
- e->waiting++;
- pthread_mutex_unlock(&e->mutex);
- e_msgport_wait(e->server_port);
- pthread_mutex_lock(&e->mutex);
- e->waiting--;
- pthread_mutex_unlock(&e->mutex);
- break;
-#if 0
- case E_THREAD_NEW:
- e->id_list = g_list_remove(e->id_list, (void *)pthread_self());
- pthread_mutex_unlock(&e->mutex);
- return 0;
-#endif
- }
-
- continue;
- } else {
- info = thread_find(e, pthread_self());
- if (info)
- info->busy = TRUE;
- }
- pthread_mutex_unlock(&e->mutex);
-
- t(printf("got message in dispatch thread\n"));
-
- /* process it */
- thread_received_msg(e, m);
-
- /* if we have a reply port, send it back, otherwise, lose it */
- if (m->reply_port) {
- e_msgport_reply(m);
- } else {
- thread_destroy_msg(e, m);
- }
- }
-
- /* if we run out of things to process we could conceivably 'hang around' for a bit,
- but to do this we need to use the fd interface of the msgport, and its utility
- is probably debatable anyway */
-
-#if 0
- /* signify we are no longer running */
- /* This code isn't used yet, but would be if we ever had a 'quit now' message implemented */
- pthread_mutex_lock(&e->mutex);
- switch (e->type) {
- case E_THREAD_QUEUE:
- case E_THREAD_DROP:
- e->id = E_THREAD_NONE;
- break;
- case E_THREAD_NEW:
- e->id_list = g_list_remove(e->id_list, (void *)pthread_self());
- break;
- }
- pthread_mutex_unlock(&e->mutex);
-#endif
-
- return 0;
-}
-
-/* send a message to the thread, start thread if necessary */
-void e_thread_put(EThread *e, EMsg *msg)
-{
- pthread_t id;
- EMsg *dmsg = NULL;
-
- pthread_mutex_lock(&e->mutex);
-
- /* the caller forgot to tell us what to do, well, we can't do anything can we */
- if (e->received == NULL) {
- pthread_mutex_unlock(&e->mutex);
- g_warning("EThread called with no receiver function, no work to do!");
- thread_destroy_msg(e, msg);
- return;
- }
-
- msg->reply_port = e->reply_port;
-
- switch(e->type) {
- case E_THREAD_QUEUE:
- /* if the queue is full, lose this new addition */
- if (e_dlist_length(&e->server_port->queue) < e->queue_limit) {
- e_msgport_put(e->server_port, msg);
- } else {
- printf("queue limit reached, dropping new message\n");
- dmsg = msg;
- }
- break;
- case E_THREAD_DROP:
- /* if the queue is full, lose the oldest (unprocessed) message */
- if (e_dlist_length(&e->server_port->queue) < e->queue_limit) {
- e_msgport_put(e->server_port, msg);
- } else {
- printf("queue limit reached, dropping old message\n");
- e_msgport_put(e->server_port, msg);
- dmsg = e_msgport_get(e->server_port);
- }
- break;
- case E_THREAD_NEW:
- /* it is possible that an existing thread can catch this message, so
- we might create a thread with no work to do.
- but that doesn't matter, the other alternative that it be lost is worse */
- e_msgport_put(e->server_port, msg);
- if (e->waiting == 0
- && g_list_length(e->id_list) < e->queue_limit
- && pthread_create(&id, NULL, thread_dispatch, e) == 0) {
- struct _thread_info *info = g_malloc0(sizeof(*info));
- t(printf("created NEW thread %ld\n", id));
- info->id = id;
- info->busy = TRUE;
- e->id_list = g_list_append(e->id_list, info);
- }
- pthread_mutex_unlock(&e->mutex);
- return;
- }
-
- /* create the thread, if there is none to receive it yet */
- if (e->id == E_THREAD_NONE) {
- if (pthread_create(&e->id, NULL, thread_dispatch, e) == -1) {
- g_warning("Could not create dispatcher thread, message queued?: %s", strerror(errno));
- e->id = E_THREAD_NONE;
- }
- }
-
- pthread_mutex_unlock(&e->mutex);
-
- if (dmsg) {
- thread_lost_msg(e, dmsg);
- thread_destroy_msg(e, dmsg);
- }
-}
-
-/* yet-another-mutex interface */
-struct _EMutex {
- int type;
- pthread_t owner;
- short waiters;
- short depth;
- pthread_mutex_t mutex;
- pthread_cond_t cond;
-};
-
-/* sigh, this is just painful to have to need, but recursive
- read/write, etc mutexes just aren't very common in thread
- implementations */
-/* TODO: Just make it use recursive mutexes if they are available */
-EMutex *e_mutex_new(e_mutex_t type)
-{
- struct _EMutex *m;
-
- m = g_malloc(sizeof(*m));
- m->type = type;
- m->waiters = 0;
- m->depth = 0;
- m->owner = E_THREAD_NONE;
-
- switch (type) {
- case E_MUTEX_SIMPLE:
- pthread_mutex_init(&m->mutex, 0);
- break;
- case E_MUTEX_REC:
- pthread_mutex_init(&m->mutex, 0);
- pthread_cond_init(&m->cond, 0);
- break;
- /* read / write ? flags for same? */
- }
-
- return m;
-}
-
-int e_mutex_destroy(EMutex *m)
-{
- int ret = 0;
-
- switch (m->type) {
- case E_MUTEX_SIMPLE:
- ret = pthread_mutex_destroy(&m->mutex);
- if (ret == -1)
- g_warning("EMutex destroy failed: %s", strerror(errno));
- g_free(m);
- break;
- case E_MUTEX_REC:
- ret = pthread_mutex_destroy(&m->mutex);
- if (ret == -1)
- g_warning("EMutex destroy failed: %s", strerror(errno));
- ret = pthread_cond_destroy(&m->cond);
- if (ret == -1)
- g_warning("EMutex destroy failed: %s", strerror(errno));
- g_free(m);
-
- }
- return ret;
-}
-
-int e_mutex_lock(EMutex *m)
-{
- pthread_t id;
-
- switch (m->type) {
- case E_MUTEX_SIMPLE:
- return pthread_mutex_lock(&m->mutex);
- case E_MUTEX_REC:
- id = pthread_self();
- if (pthread_mutex_lock(&m->mutex) == -1)
- return -1;
- while (1) {
- if (m->owner == E_THREAD_NONE) {
- m->owner = id;
- m->depth = 1;
- break;
- } else if (id == m->owner) {
- m->depth++;
- break;
- } else {
- m->waiters++;
- if (pthread_cond_wait(&m->cond, &m->mutex) == -1)
- return -1;
- m->waiters--;
- }
- }
- return pthread_mutex_unlock(&m->mutex);
- }
-
- errno = EINVAL;
- return -1;
-}
-
-int e_mutex_unlock(EMutex *m)
-{
- switch (m->type) {
- case E_MUTEX_SIMPLE:
- return pthread_mutex_unlock(&m->mutex);
- case E_MUTEX_REC:
- if (pthread_mutex_lock(&m->mutex) == -1)
- return -1;
- g_assert(m->owner == pthread_self());
-
- m->depth--;
- if (m->depth == 0) {
- m->owner = E_THREAD_NONE;
- if (m->waiters > 0)
- pthread_cond_signal(&m->cond);
- }
- return pthread_mutex_unlock(&m->mutex);
- }
-
- errno = EINVAL;
- return -1;
-}
-
-void e_mutex_assert_locked(EMutex *m)
-{
- g_return_if_fail (m->type == E_MUTEX_REC);
- pthread_mutex_lock(&m->mutex);
- g_assert(m->owner == pthread_self());
- pthread_mutex_unlock(&m->mutex);
-}
-
-#ifdef STANDALONE
-EMsgPort *server_port;
-
-
-void *fdserver(void *data)
-{
- int fd;
- EMsg *msg;
- int id = (int)data;
- fd_set rfds;
-
- fd = e_msgport_fd(server_port);
-
- while (1) {
- int count = 0;
-
- printf("server %d: waiting on fd %d\n", id, fd);
- FD_ZERO(&rfds);
- FD_SET(fd, &rfds);
- select(fd+1, &rfds, NULL, NULL, NULL);
- printf("server %d: Got async notification, checking for messages\n", id);
- while ((msg = e_msgport_get(server_port))) {
- printf("server %d: got message\n", id);
- sleep(1);
- printf("server %d: replying\n", id);
- e_msgport_reply(msg);
- count++;
- }
- printf("server %d: got %d messages\n", id, count);
- }
-}
-
-void *server(void *data)
-{
- EMsg *msg;
- int id = (int)data;
-
- while (1) {
- printf("server %d: waiting\n", id);
- msg = e_msgport_wait(server_port);
- msg = e_msgport_get(server_port);
- if (msg) {
- printf("server %d: got message\n", id);
- sleep(1);
- printf("server %d: replying\n", id);
- e_msgport_reply(msg);
- } else {
- printf("server %d: didn't get message\n", id);
- }
- }
-}
-
-void *client(void *data)
-{
- EMsg *msg;
- EMsgPort *replyport;
- int i;
-
- replyport = e_msgport_new();
- msg = g_malloc0(sizeof(*msg));
- msg->reply_port = replyport;
- for (i=0;i<10;i++) {
- /* synchronous operation */
- printf("client: sending\n");
- e_msgport_put(server_port, msg);
- printf("client: waiting for reply\n");
- e_msgport_wait(replyport);
- e_msgport_get(replyport);
- printf("client: got reply\n");
- }
-
- printf("client: sleeping ...\n");
- sleep(2);
- printf("client: sending multiple\n");
-
- for (i=0;i<10;i++) {
- msg = g_malloc0(sizeof(*msg));
- msg->reply_port = replyport;
- e_msgport_put(server_port, msg);
- }
-
- printf("client: receiving multiple\n");
- for (i=0;i<10;i++) {
- e_msgport_wait(replyport);
- msg = e_msgport_get(replyport);
- g_free(msg);
- }
-
- printf("client: done\n");
-}
-
-int main(int argc, char **argv)
-{
- pthread_t serverid, clientid;
-
- g_thread_init(NULL);
-
- server_port = e_msgport_new();
-
- /*pthread_create(&serverid, NULL, server, (void *)1);*/
- pthread_create(&serverid, NULL, fdserver, (void *)1);
- pthread_create(&clientid, NULL, client, NULL);
-
- sleep(60);
-
- return 0;
-}
-#endif
generated by cgit (git 2.34.1) at 2024-11-22 12:28:43 +0800