X-Git-Url: http://git.demorecorder.com/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fxcb_out.c;h=26679732698c52c3c389c15faec75c592ffbd0b7;hb=162c7593adf1577ca8aecfcd53fd5644b6182609;hp=cecf7cb19398251d221d9b6b7fdad181be255fba;hpb=7f0bc778c88ab2f565cc05d5d3d5ee4c8d1388a1;p=free-sw%2Fxcb%2Flibxcb

diff --git a/src/xcb_out.c b/src/xcb_out.c
index cecf7cb..2667973 100644
--- a/src/xcb_out.c
+++ b/src/xcb_out.c
@@ -29,67 +29,30 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
-#include <errno.h>
-
-#ifndef __GNUC__
-# if HAVE_ALLOCA_H
-#  include <alloca.h>
-# else
-#  ifdef _AIX
- #pragma alloca
-#  endif
-# endif
-#endif
 
 #include "xcb.h"
 #include "xcbext.h"
 #include "xcbint.h"
 #include "extensions/bigreq.h"
 
-static int force_sequence_wrap(XCBConnection *c)
-{
-    int ret = 1;
-    if((c->out.request - c->in.request_read) > 65530)
-    {
-        pthread_mutex_unlock(&c->iolock);
-        ret = XCBSync(c, 0);
-        pthread_mutex_lock(&c->iolock);
-    }
-    return ret;
-}
-
-static int _xcb_write(const int fd, char (*buf)[], int *count)
+static int write_block(XCBConnection *c, struct iovec *vector, int count)
 {
-    int n = write(fd, *buf, *count);
-    if(n > 0)
+    while(count && c->out.queue_len + vector[0].iov_len <= sizeof(c->out.queue))
     {
-        *count -= n;
-        if(*count)
-            memmove(*buf, *buf + n, *count);
+        memcpy(c->out.queue + c->out.queue_len, vector[0].iov_base, vector[0].iov_len);
+        c->out.queue_len += vector[0].iov_len;
+        vector[0].iov_base = (char *) vector[0].iov_base + vector[0].iov_len;
+        vector[0].iov_len = 0;
+        ++vector, --count;
     }
-    return n;
-}
+    if(!count)
+        return 1;
 
-static int _xcb_writev(const int fd, struct iovec *vec, int count)
-{
-    int n = writev(fd, vec, count);
-    if(n > 0)
-    {
-        int rem = n;
-        for(; count; --count, ++vec)
-        {
-            int cur = vec->iov_len;
-            if(cur > rem)
-                cur = rem;
-            vec->iov_len -= cur;
-            vec->iov_base = (char *) vec->iov_base + cur;
-            rem -= cur;
-            if(vec->iov_len)
-                break;
-        }
-        assert(rem == 0);
-    }
-    return n;
+    --vector, ++count;
+    vector[0].iov_base = c->out.queue;
+    vector[0].iov_len = c->out.queue_len;
+    c->out.queue_len = 0;
+    return _xcb_out_send(c, &vector, &count);
 }
 
 /* Public interface */
@@ -113,119 +76,124 @@ CARD32 XCBGetMaximumRequestLength(XCBConnection *c)
     return c->out.maximum_request_length;
 }
 
-int XCBSendRequest(XCBConnection *c, unsigned int *request, struct iovec *vector, const XCBProtocolRequest *req)
+unsigned int XCBSendRequest(XCBConnection *c, int flags, struct iovec *vector, const XCBProtocolRequest *req)
 {
-    static const char pad[3];
-    int ret;
-    int i;
-    struct iovec *padded;
-    int padlen = 0;
-    CARD16 shortlen = 0;
-    CARD32 longlen = 0;
+    static const union {
+        struct {
+            CARD8 major;
+            CARD8 pad;
+            CARD16 len;
+        } fields;
+        CARD32 packet;
+    } sync = { { /* GetInputFocus */ 43, 0, 1 } };
+    unsigned int request;
+    CARD32 prefix[3] = { 0 };
+    int veclen = req->count;
     enum workarounds workaround = WORKAROUND_NONE;
 
     assert(c != 0);
-    assert(request != 0);
     assert(vector != 0);
     assert(req->count > 0);
 
-    /* set the major opcode, and the minor opcode for extensions */
-    if(req->ext)
+    if(!(flags & XCB_REQUEST_RAW))
     {
-        const XCBQueryExtensionRep *extension = XCBGetExtensionData(c, req->ext);
-        /* TODO: better error handling here, please! */
-        assert(extension && extension->present);
-        ((CARD8 *) vector[0].iov_base)[0] = extension->major_opcode;
-        ((CARD8 *) vector[0].iov_base)[1] = req->opcode;
-
-        /* do we need to work around the X server bug described in glx.xml? */
-        if(strcmp(req->ext->name, "GLX") &&
-                ((req->opcode == 17 && ((CARD32 *) vector[0].iov_base)[0] == 0x10004) ||
-                 req->opcode == 21))
-            workaround = WORKAROUND_GLX_GET_FB_CONFIGS_BUG;
-    }
-    else
-        ((CARD8 *) vector[0].iov_base)[0] = req->opcode;
+        static const char pad[3];
+        int i;
+        CARD16 shortlen = 0;
+        size_t longlen = 0;
+        assert(vector[0].iov_len >= 4);
+        /* set the major opcode, and the minor opcode for extensions */
+        if(req->ext)
+        {
+            const XCBQueryExtensionRep *extension = XCBGetExtensionData(c, req->ext);
+            if(!(extension && extension->present))
+                return 0;
+            ((CARD8 *) vector[0].iov_base)[0] = extension->major_opcode;
+            ((CARD8 *) vector[0].iov_base)[1] = req->opcode;
+        }
+        else
+            ((CARD8 *) vector[0].iov_base)[0] = req->opcode;
 
-    /* put together the length field, possibly using BIGREQUESTS */
-    for(i = 0; i < req->count; ++i)
-        longlen += XCB_CEIL(vector[i].iov_len) >> 2;
+        /* put together the length field, possibly using BIGREQUESTS */
+        for(i = 0; i < req->count; ++i)
+        {
+            longlen += vector[i].iov_len;
+            if(!vector[i].iov_base)
+            {
+                vector[i].iov_base = (char *) pad;
+                assert(vector[i].iov_len <= sizeof(pad));
+            }
+        }
+        assert((longlen & 3) == 0);
+        longlen >>= 2;
 
-    if(longlen > c->setup->maximum_request_length)
-    {
-        if(longlen > XCBGetMaximumRequestLength(c))
+        if(longlen <= c->setup->maximum_request_length)
+        {
+            /* we don't need BIGREQUESTS. */
+            shortlen = longlen;
+            longlen = 0;
+        }
+        else if(longlen > XCBGetMaximumRequestLength(c))
             return 0; /* server can't take this; maybe need BIGREQUESTS? */
-    }
-    else
-    {
-        /* we don't need BIGREQUESTS. */
-        shortlen = longlen;
-        longlen = 0;
-    }
 
-    padded =
-#ifdef HAVE_ALLOCA
-        alloca
-#else
-        malloc
-#endif
-        ((req->count * 2 + 3) * sizeof(struct iovec));
-    /* set the length field. */
-    ((CARD16 *) vector[0].iov_base)[1] = shortlen;
-    if(!shortlen)
-    {
-        padded[0].iov_base = vector[0].iov_base;
-        padded[0].iov_len = sizeof(CARD32);
-        vector[0].iov_base = ((char *) vector[0].iov_base) + sizeof(CARD32);
-        vector[0].iov_len -= sizeof(CARD32);
-        ++longlen;
-        padded[1].iov_base = &longlen;
-        padded[1].iov_len = sizeof(CARD32);
-        padlen = 2;
+        /* set the length field. */
+        ((CARD16 *) vector[0].iov_base)[1] = shortlen;
+        if(!shortlen)
+            prefix[2] = ++longlen;
     }
+    flags &= ~XCB_REQUEST_RAW;
 
-    for(i = 0; i < req->count; ++i)
-    {
-        if(!vector[i].iov_len)
-            continue;
-        padded[padlen].iov_base = vector[i].iov_base;
-        padded[padlen++].iov_len = vector[i].iov_len;
-        if(!XCB_PAD(vector[i].iov_len))
-            continue;
-        padded[padlen].iov_base = (caddr_t) pad;
-        padded[padlen++].iov_len = XCB_PAD(vector[i].iov_len);
-    }
+    /* do we need to work around the X server bug described in glx.xml? */
+    if(req->ext && !req->isvoid && strcmp(req->ext->name, "GLX") &&
+            ((req->opcode == 17 && ((CARD32 *) vector[0].iov_base)[0] == 0x10004) ||
+             req->opcode == 21))
+        workaround = WORKAROUND_GLX_GET_FB_CONFIGS_BUG;
 
     /* get a sequence number and arrange for delivery. */
     pthread_mutex_lock(&c->iolock);
-    if(req->isvoid && !force_sequence_wrap(c))
+    /* wait for other writing threads to get out of my way. */
+    while(c->out.writing)
+        pthread_cond_wait(&c->out.cond, &c->iolock);
+
+    if(req->isvoid && c->out.request == c->in.request_expected + (1 << 16) - 2)
     {
-        pthread_mutex_unlock(&c->iolock);
-#ifndef HAVE_ALLOCA
-        free(padded);
-#endif
-        return -1;
+        prefix[0] = sync.packet;
+        request = ++c->out.request;
+        _xcb_in_expect_reply(c, request, WORKAROUND_NONE, XCB_REQUEST_DISCARD_REPLY);
+        c->in.request_expected = c->out.request;
     }
 
-    *request = ++c->out.request;
-
+    request = ++c->out.request;
+    assert(request != 0);
+    if(workaround != WORKAROUND_NONE || flags != 0)
+        _xcb_in_expect_reply(c, request, workaround, flags);
     if(!req->isvoid)
-        _xcb_in_expect_reply(c, *request, workaround);
+        c->in.request_expected = c->out.request;
 
-    ret = _xcb_out_write_block(c, padded, padlen);
-    pthread_mutex_unlock(&c->iolock);
-#ifndef HAVE_ALLOCA
-    free(padded);
-#endif
+    if(prefix[0] || prefix[2])
+    {
+        --vector, ++veclen;
+        if(prefix[2])
+        {
+            prefix[1] = ((CARD32 *) vector[1].iov_base)[0];
+            vector[1].iov_base = (CARD32 *) vector[1].iov_base + 1;
+            vector[1].iov_len -= sizeof(CARD32);
+        }
+        vector[0].iov_len = sizeof(CARD32) * (prefix[0] ? 1 : 0 | prefix[2] ? 2 : 0);
+        vector[0].iov_base = prefix + !prefix[0];
+    }
 
-    return ret;
+    if(!write_block(c, vector, veclen))
+        request = 0;
+    pthread_mutex_unlock(&c->iolock);
+    return request;
 }
 
 int XCBFlush(XCBConnection *c)
 {
     int ret;
     pthread_mutex_lock(&c->iolock);
-    ret = _xcb_out_flush(c);
+    ret = _xcb_out_flush_to(c, c->out.request);
     pthread_mutex_unlock(&c->iolock);
     return ret;
 }
@@ -239,8 +207,6 @@ int _xcb_out_init(_xcb_out *out)
     out->writing = 0;
 
     out->queue_len = 0;
-    out->vec = 0;
-    out->vec_len = 0;
 
     out->request = 0;
     out->request_written = 0;
@@ -256,62 +222,34 @@ void _xcb_out_destroy(_xcb_out *out)
 {
     pthread_cond_destroy(&out->cond);
     pthread_mutex_destroy(&out->reqlenlock);
-    free(out->vec);
 }
 
-int _xcb_out_write(XCBConnection *c)
+int _xcb_out_send(XCBConnection *c, struct iovec **vector, int *count)
 {
-    int n;
-    if(c->out.vec_len)
-        n = _xcb_writev(c->fd, c->out.vec, c->out.vec_len);
-    else
-        n = _xcb_write(c->fd, &c->out.queue, &c->out.queue_len);
-
-    /* XXX: should "nothing was written" be considered failure or
-     * success for this function? it's not an I/O error, but... */
-    n = (n > 0) || (n < 0 && errno == EAGAIN);
-
-    if(c->out.vec_len)
-    {
-        int i;
-        for(i = 0; i < c->out.vec_len; ++i)
-            if(c->out.vec[i].iov_len)
-                return n;
-        c->out.vec = 0;
-        c->out.vec_len = 0;
-    }
-    return n;
+    int ret = 1;
+    while(ret && *count)
+        ret = _xcb_conn_wait(c, &c->out.cond, vector, count);
+    c->out.request_written = c->out.request;
+    pthread_cond_broadcast(&c->out.cond);
+    return ret;
 }
 
-int _xcb_out_write_block(XCBConnection *c, struct iovec *vector, size_t count)
+int _xcb_out_flush_to(XCBConnection *c, unsigned int request)
 {
-    while(count && c->out.queue_len + vector[0].iov_len < sizeof(c->out.queue))
+    assert(request <= c->out.request);
+    if(c->out.request_written >= request)
+        return 1;
+    if(c->out.queue_len)
     {
-        memcpy(c->out.queue + c->out.queue_len, vector[0].iov_base, vector[0].iov_len);
-        c->out.queue_len += vector[0].iov_len;
-        ++vector, --count;
+        struct iovec vec, *vec_ptr = &vec;
+        int count = 1;
+        vec.iov_base = c->out.queue;
+        vec.iov_len = c->out.queue_len;
+        c->out.queue_len = 0;
+        return _xcb_out_send(c, &vec_ptr, &count);
     }
-    if(!count)
-        return 1;
-
-    memmove(vector + 1, vector, count++ * sizeof(struct iovec));
-    vector[0].iov_base = c->out.queue;
-    vector[0].iov_len = c->out.queue_len;
-    c->out.queue_len = 0;
-
-    assert(!c->out.vec_len);
-    assert(!c->out.vec);
-    c->out.vec_len = count;
-    c->out.vec = vector;
-    return _xcb_out_flush(c);
-}
-
-int _xcb_out_flush(XCBConnection *c)
-{
-    int ret = 1;
-    while(ret && (c->out.queue_len || c->out.vec_len))
-        ret = _xcb_conn_wait(c, /*should_write*/ 1, &c->out.cond);
-    c->out.request_written = c->out.request;
-    pthread_cond_broadcast(&c->out.cond);
-    return ret;
+    while(c->out.writing)
+        pthread_cond_wait(&c->out.cond, &c->iolock);
+    assert(c->out.request_written >= request);
+    return 1;
 }