9e472e101f
Replace signalfd with signal handler/pipe. There is no way to interrupt
the CPU execution loop when a file descriptor becomes readable. This
results in a large performance regression in sparc emulation during
bootup.
This patch switches us to signal handler/pipe which was originally
suggested by Ian Jackson. The signal handler lets us interrupt the
CPU emulation loop while the write to a pipe lets us avoid the
select/signal race condition.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5451 c046a42c-6fe2-441c-8c8c-71466251a162
88 lines
1.4 KiB
C
88 lines
1.4 KiB
C
/*
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* Compatibility for qemu-img/qemu-nbd
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "qemu-common.h"
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#include "console.h"
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#include "sysemu.h"
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#include "qemu-timer.h"
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#include <sys/time.h>
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QEMUClock *rt_clock;
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struct QEMUBH
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{
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QEMUBHFunc *cb;
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void *opaque;
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};
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void qemu_service_io(void)
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{
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}
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void term_printf(const char *fmt, ...)
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{
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}
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void term_print_filename(const char *filename)
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{
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}
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QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque)
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{
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QEMUBH *bh;
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bh = qemu_malloc(sizeof(*bh));
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if (bh) {
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bh->cb = cb;
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bh->opaque = opaque;
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}
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return bh;
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}
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int qemu_bh_poll(void)
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{
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return 0;
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}
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void qemu_bh_schedule(QEMUBH *bh)
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{
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bh->cb(bh->opaque);
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}
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void qemu_bh_cancel(QEMUBH *bh)
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{
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}
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void qemu_bh_delete(QEMUBH *bh)
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{
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qemu_free(bh);
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}
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int qemu_set_fd_handler2(int fd,
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IOCanRWHandler *fd_read_poll,
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IOHandler *fd_read,
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IOHandler *fd_write,
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void *opaque)
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{
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return 0;
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}
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int64_t qemu_get_clock(QEMUClock *clock)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return (tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000)) / 1000000;
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}
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