d3385eb448
Right now, the main loop is not interrupted when data arrives on a socket. To fix this, register each socket to interrupt the main loop with WSAEventSelect. This does not replace select, it only communicates a change in socket state that requires a select call. Since the interrupt fires only once per recv call, or only once after a send call returns EWOULDBLOCK we can activate it on all events unconditionally. If QEMU is momentarily uninterested on some condition, the main loop will not busy wait. Instead, it may get one extra wakeup, but then it will ignore the condition until progress occurs and/or qemu_set_fd_handler is called to set a callback. At this point the condition will be tested via select and the callback will be invoked even if it is still disabled on the event. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/*
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* os-win32.c
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2010 Red Hat, Inc.
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*
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* QEMU library functions for win32 which are shared between QEMU and
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* the QEMU tools.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <windows.h>
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#include "config-host.h"
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#include "sysemu.h"
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#include "main-loop.h"
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#include "trace.h"
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#include "qemu_socket.h"
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void *qemu_oom_check(void *ptr)
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{
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if (ptr == NULL) {
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fprintf(stderr, "Failed to allocate memory: %lu\n", GetLastError());
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abort();
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}
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return ptr;
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}
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void *qemu_memalign(size_t alignment, size_t size)
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{
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void *ptr;
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if (!size) {
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abort();
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}
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ptr = qemu_oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
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trace_qemu_memalign(alignment, size, ptr);
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return ptr;
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}
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void *qemu_vmalloc(size_t size)
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{
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void *ptr;
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/* FIXME: this is not exactly optimal solution since VirtualAlloc
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has 64Kb granularity, but at least it guarantees us that the
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memory is page aligned. */
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if (!size) {
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abort();
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}
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ptr = qemu_oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
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trace_qemu_vmalloc(size, ptr);
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return ptr;
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}
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void qemu_vfree(void *ptr)
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{
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trace_qemu_vfree(ptr);
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VirtualFree(ptr, 0, MEM_RELEASE);
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}
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void socket_set_block(int fd)
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{
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unsigned long opt = 0;
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WSAEventSelect(fd, NULL, 0);
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ioctlsocket(fd, FIONBIO, &opt);
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}
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void socket_set_nonblock(int fd)
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{
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unsigned long opt = 1;
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ioctlsocket(fd, FIONBIO, &opt);
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qemu_fd_register(fd);
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}
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int inet_aton(const char *cp, struct in_addr *ia)
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{
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uint32_t addr = inet_addr(cp);
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if (addr == 0xffffffff) {
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return 0;
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}
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ia->s_addr = addr;
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return 1;
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}
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void qemu_set_cloexec(int fd)
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{
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}
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/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
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#define _W32_FT_OFFSET (116444736000000000ULL)
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int qemu_gettimeofday(qemu_timeval *tp)
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{
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union {
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unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
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FILETIME ft;
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} _now;
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if(tp) {
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GetSystemTimeAsFileTime (&_now.ft);
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tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
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tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
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}
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/* Always return 0 as per Open Group Base Specifications Issue 6.
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Do not set errno on error. */
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return 0;
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}
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int qemu_get_thread_id(void)
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{
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return GetCurrentThreadId();
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}
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