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use eventfd for iothread

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Paolo Bonzini 2010-02-11 00:23:46 +01:00 • committed by Avi Kivity
parent bf76bafa5a
commit f3dfda6114
3 changed files with 38 additions and 4 deletions
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32
osdep.c
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@ -37,6 +37,10 @@
#include <sys/statvfs.h>
#endif
#ifdef CONFIG_EVENTFD
#include <sys/eventfd.h>
#endif
#ifdef _WIN32
#include <windows.h>
#elif defined(CONFIG_BSD)
@ -280,6 +284,34 @@ ssize_t qemu_write_full(int fd, const void *buf, size_t count)
}
#ifndef _WIN32
/*
* Creates an eventfd that looks like a pipe and has EFD_CLOEXEC set.
*/
int qemu_eventfd(int fds[2])
{
int ret;
#ifdef CONFIG_EVENTFD
ret = eventfd(0, 0);
if (ret >= 0) {
fds[0] = ret;
qemu_set_cloexec(ret);
if ((fds[1] = dup(ret)) == -1) {
close(ret);
return -1;
}
qemu_set_cloexec(fds[1]);
return 0;
}
if (errno != ENOSYS) {
return -1;
}
#endif
return qemu_pipe(fds);
}
/*
* Creates a pipe with FD_CLOEXEC set on both file descriptors
*/