diff options
Diffstat (limited to 'libxcb/src/xcb_out.c')
| -rw-r--r-- | libxcb/src/xcb_out.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/libxcb/src/xcb_out.c b/libxcb/src/xcb_out.c new file mode 100644 index 000000000..60226e581 --- /dev/null +++ b/libxcb/src/xcb_out.c @@ -0,0 +1,303 @@ +/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * Except as contained in this notice, the names of the authors or their + * institutions shall not be used in advertising or otherwise to promote the + * sale, use or other dealings in this Software without prior written + * authorization from the authors. + */ + +/* Stuff that sends stuff to the server. */ + +#include <assert.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> + +#include "xcb.h" +#include "xcbext.h" +#include "xcbint.h" +#include "bigreq.h" + +static int write_block(xcb_connection_t *c, struct iovec *vector, int count) +{ + while(count && c->out.queue_len + vector[0].iov_len <= sizeof(c->out.queue)) + { + 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; + } + if(!count) + return 1; + + --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 */ + +void xcb_prefetch_maximum_request_length(xcb_connection_t *c) +{ + if(c->has_error) + return; + pthread_mutex_lock(&c->out.reqlenlock); + if(c->out.maximum_request_length_tag == LAZY_NONE) + { + const xcb_query_extension_reply_t *ext; + ext = xcb_get_extension_data(c, &xcb_big_requests_id); + if(ext && ext->present) + { + c->out.maximum_request_length_tag = LAZY_COOKIE; + c->out.maximum_request_length.cookie = xcb_big_requests_enable(c); + } + else + { + c->out.maximum_request_length_tag = LAZY_FORCED; + c->out.maximum_request_length.value = c->setup->maximum_request_length; + } + } + pthread_mutex_unlock(&c->out.reqlenlock); +} + +uint32_t xcb_get_maximum_request_length(xcb_connection_t *c) +{ + if(c->has_error) + return 0; + xcb_prefetch_maximum_request_length(c); + pthread_mutex_lock(&c->out.reqlenlock); + if(c->out.maximum_request_length_tag == LAZY_COOKIE) + { + xcb_big_requests_enable_reply_t *r = xcb_big_requests_enable_reply(c, c->out.maximum_request_length.cookie, 0); + c->out.maximum_request_length_tag = LAZY_FORCED; + if(r) + { + c->out.maximum_request_length.value = r->maximum_request_length; + free(r); + } + else + c->out.maximum_request_length.value = c->setup->maximum_request_length; + } + pthread_mutex_unlock(&c->out.reqlenlock); + return c->out.maximum_request_length.value; +} + +unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vector, const xcb_protocol_request_t *req) +{ + static const union { + struct { + uint8_t major; + uint8_t pad; + uint16_t len; + } fields; + uint32_t packet; + } sync = { { /* GetInputFocus */ 43, 0, 1 } }; + unsigned int request; + uint32_t prefix[3] = { 0 }; + int veclen = req->count; + enum workarounds workaround = WORKAROUND_NONE; + + if(c->has_error) + return 0; + + assert(c != 0); + assert(vector != 0); + assert(req->count > 0); + + if(!(flags & XCB_REQUEST_RAW)) + { + static const char pad[3]; + int i; + uint16_t 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 xcb_query_extension_reply_t *extension = xcb_get_extension_data(c, req->ext); + if(!(extension && extension->present)) + { + _xcb_conn_shutdown(c); + return 0; + } + ((uint8_t *) vector[0].iov_base)[0] = extension->major_opcode; + ((uint8_t *) vector[0].iov_base)[1] = req->opcode; + } + else + ((uint8_t *) vector[0].iov_base)[0] = req->opcode; + + /* 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) + { + /* we don't need BIGREQUESTS. */ + shortlen = longlen; + longlen = 0; + } + else if(longlen > xcb_get_maximum_request_length(c)) + { + _xcb_conn_shutdown(c); + return 0; /* server can't take this; maybe need BIGREQUESTS? */ + } + + /* set the length field. */ + ((uint16_t *) vector[0].iov_base)[1] = shortlen; + if(!shortlen) + prefix[2] = ++longlen; + } + flags &= ~XCB_REQUEST_RAW; + + /* do we need to work around the X server bug described in glx.xml? */ + /* XXX: GetFBConfigs won't use BIG-REQUESTS in any sane + * configuration, but that should be handled here anyway. */ + if(req->ext && !req->isvoid && !strcmp(req->ext->name, "GLX") && + ((req->opcode == 17 && ((uint32_t *) vector[0].iov_base)[1] == 0x10004) || + req->opcode == 21)) + workaround = WORKAROUND_GLX_GET_FB_CONFIGS_BUG; + + /* get a sequence number and arrange for delivery. */ + _xcb_lock_io(c); + /* wait for other writing threads to get out of my way. */ + while(c->out.writing) + _xcb_wait_io(c, &c->out.cond); + + request = ++c->out.request; + /* send GetInputFocus (sync) when 64k-2 requests have been sent without + * a reply. + * Also send sync (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 */ + while((req->isvoid && + c->out.request == c->in.request_expected + (1 << 16) - 1) || + request == 0) + { + prefix[0] = sync.packet; + _xcb_in_expect_reply(c, request, WORKAROUND_NONE, XCB_REQUEST_DISCARD_REPLY); + c->in.request_expected = c->out.request; + request = ++c->out.request; + } + + if(workaround != WORKAROUND_NONE || flags != 0) + _xcb_in_expect_reply(c, request, workaround, flags); + if(!req->isvoid) + c->in.request_expected = c->out.request; + + if(prefix[0] || prefix[2]) + { + --vector, ++veclen; + if(prefix[2]) + { + prefix[1] = ((uint32_t *) vector[1].iov_base)[0]; + vector[1].iov_base = (uint32_t *) vector[1].iov_base + 1; + vector[1].iov_len -= sizeof(uint32_t); + } + vector[0].iov_len = sizeof(uint32_t) * (prefix[0] ? 1 : 0 | prefix[2] ? 2 : 0); + vector[0].iov_base = prefix + !prefix[0]; + } + + if(!write_block(c, vector, veclen)) + { + _xcb_conn_shutdown(c); + request = 0; + } + _xcb_unlock_io(c); + return request; +} + +int xcb_flush(xcb_connection_t *c) +{ + int ret; + if(c->has_error) + return 0; + _xcb_lock_io(c); + ret = _xcb_out_flush_to(c, c->out.request); + _xcb_unlock_io(c); + return ret; +} + +/* Private interface */ + +int _xcb_out_init(_xcb_out *out) +{ + if(pthread_cond_init(&out->cond, 0)) + return 0; + out->writing = 0; + + out->queue_len = 0; + + out->request = 0; + out->request_written = 0; + + if(pthread_mutex_init(&out->reqlenlock, 0)) + return 0; + out->maximum_request_length_tag = LAZY_NONE; + + return 1; +} + +void _xcb_out_destroy(_xcb_out *out) +{ + pthread_cond_destroy(&out->cond); + pthread_mutex_destroy(&out->reqlenlock); +} + +int _xcb_out_send(xcb_connection_t *c, struct iovec **vector, int *count) +{ + 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_flush_to(xcb_connection_t *c, unsigned int request) +{ + assert(XCB_SEQUENCE_COMPARE(request, <=, c->out.request)); + if(XCB_SEQUENCE_COMPARE(c->out.request_written, >=, request)) + return 1; + if(c->out.queue_len) + { + 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); + } + while(c->out.writing) + _xcb_wait_io(c, &c->out.cond); + assert(XCB_SEQUENCE_COMPARE(c->out.request_written, >=, request)); + return 1; +} |