generator: support listelement-ref

[free-sw/xcb/libxcb] / src / xcb_out.c

diff --git a/src/xcb_out.c b/src/xcb_out.c
index d6082fc..dc42954 100644 (file)
--- a/src/xcb_out.c
+++ b/src/xcb_out.c
@@ -25,6 +25,10 @@
 
 /* Stuff that sends stuff to the server. */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <assert.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -99,6 +103,33 @@ static void get_socket_back(xcb_connection_t *c)
     _xcb_in_replies_done(c);
 }
 
+static void prepare_socket_request(xcb_connection_t *c)
+{
+    /* We're about to append data to out.queue, so we need to
+     * atomically test for an external socket owner *and* some other
+     * thread currently writing.
+     *
+     * If we have an external socket owner, we have to get the socket back
+     * before we can use it again.
+     *
+     * If some other thread is writing to the socket, we assume it's
+     * writing from out.queue, and so we can't stick data there.
+     *
+     * We satisfy this condition by first calling get_socket_back
+     * (which may drop the lock, but will return when XCB owns the
+     * socket again) and then checking for another writing thread and
+     * escaping the loop if we're ready to go.
+     */
+    for (;;) {
+        if(c->has_error)
+            return;
+        get_socket_back(c);
+        if (!c->out.writing)
+            break;
+        pthread_cond_wait(&c->out.cond, &c->iolock);
+    }
+}
+
 /* Public interface */
 
 void xcb_prefetch_maximum_request_length(xcb_connection_t *c)
@@ -173,7 +204,7 @@ unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vect
             const xcb_query_extension_reply_t *extension = xcb_get_extension_data(c, req->ext);
             if(!(extension && extension->present))
             {
-                _xcb_conn_shutdown(c);
+                _xcb_conn_shutdown(c, XCB_CONN_CLOSED_EXT_NOTSUPPORTED);
                 return 0;
             }
             ((uint8_t *) vector[0].iov_base)[0] = extension->major_opcode;
@@ -203,7 +234,7 @@ unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vect
         }
         else if(longlen > xcb_get_maximum_request_length(c))
         {
-            _xcb_conn_shutdown(c);
+            _xcb_conn_shutdown(c, XCB_CONN_CLOSED_REQ_LEN_EXCEED);
             return 0; /* server can't take this; maybe need BIGREQUESTS? */
         }
 
@@ -232,30 +263,47 @@ unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vect
 
     /* get a sequence number and arrange for delivery. */
     pthread_mutex_lock(&c->iolock);
-    /* wait for other writing threads to get out of my way. */
-    while(c->out.writing)
-        pthread_cond_wait(&c->out.cond, &c->iolock);
-    get_socket_back(c);
+
+    prepare_socket_request(c);
 
     /* send GetInputFocus (sync_req) when 64k-2 requests have been sent without
-     * a reply. */
-    if(req->isvoid && c->out.request == c->in.request_expected + (1 << 16) - 2)
-        send_sync(c);
-    /* Also send sync_req (could use NoOp) at 32-bit wrap to avoid having
+     * a reply.
+     * Also send sync_req (could use NoOp) at 32-bit wrap to avoid having
      * applications see sequence 0 as that is used to indicate
-     * an error in sending the request */
-    if((unsigned int) (c->out.request + 1) == 0)
+     * an error in sending the request
+     */
+     
+    while ((req->isvoid && c->out.request == c->in.request_expected + (1 << 16) - 2) ||
+           (unsigned int) (c->out.request + 1) == 0)
+    {
         send_sync(c);
+        prepare_socket_request(c);
+    }
 
-    /* The above send_sync calls could drop the I/O lock, but this
-     * thread will still exclude any other thread that tries to write,
-     * so the sequence number postconditions still hold. */
     send_request(c, req->isvoid, workaround, flags, vector, veclen);
     request = c->has_error ? 0 : c->out.request;
     pthread_mutex_unlock(&c->iolock);
     return request;
 }
 
+void
+xcb_send_fd(xcb_connection_t *c, int fd)
+{
+#if HAVE_SENDMSG
+    if (c->has_error)
+        return;
+    pthread_mutex_lock(&c->iolock);
+    while (c->out.out_fd.nfd == XCB_MAX_PASS_FD) {
+        _xcb_out_flush_to(c, c->out.request);
+        if (c->has_error)
+            break;
+    }
+    if (!c->has_error)
+        c->out.out_fd.fd[c->out.out_fd.nfd++] = fd;
+    pthread_mutex_unlock(&c->iolock);
+#endif
+}
+
 int xcb_take_socket(xcb_connection_t *c, void (*return_socket)(void *closure), void *closure, int flags, uint64_t *sent)
 {
     int ret;
@@ -268,7 +316,7 @@ int xcb_take_socket(xcb_connection_t *c, void (*return_socket)(void *closure), v
      * write requests, so keep flushing until we're done
      */
     do
-           ret = _xcb_out_flush_to(c, c->out.request);
+        ret = _xcb_out_flush_to(c, c->out.request);
     while (ret && c->out.request != c->out.request_written);
     if(ret)
     {
@@ -351,10 +399,7 @@ int _xcb_out_send(xcb_connection_t *c, struct iovec *vector, int count)
 
 void _xcb_out_send_sync(xcb_connection_t *c)
 {
-    /* wait for other writing threads to get out of my way. */
-    while(c->out.writing)
-        pthread_cond_wait(&c->out.cond, &c->iolock);
-    get_socket_back(c);
+    prepare_socket_request(c);
     send_sync(c);
 }