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Split out bottom halves

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Instead of putting more and more stuff into vl.c, let's have the generic
functions that deal with asynchronous callbacks in their own file.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Kevin Wolf 2009-10-22 17:54:37 +02:00 committed by Anthony Liguori
parent 8febfa2684
commit 4f999d05f5
4 changed files with 132 additions and 105 deletions
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2
Makefile.target
View File

@ -154,7 +154,7 @@ endif #CONFIG_BSD_USER
# System emulator target
ifdef CONFIG_SOFTMMU
obj-y = vl.o monitor.o pci.o machine.o gdbstub.o
obj-y = vl.o async.o monitor.o pci.o machine.o gdbstub.o
# virtio has to be here due to weird dependency between PCI and virtio-net.
# need to fix this properly
obj-y += virtio-blk.o virtio-balloon.o virtio-net.o virtio-console.o virtio-pci.o

130
async.c Normal file
View File

@ -0,0 +1,130 @@
/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* 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 OR COPYRIGHT HOLDERS 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.
*/
#include "qemu-common.h"
/***********************************************************/
/* bottom halves (can be seen as timers which expire ASAP) */
struct QEMUBH {
QEMUBHFunc *cb;
void *opaque;
int scheduled;
int idle;
int deleted;
QEMUBH *next;
};
static QEMUBH *first_bh = NULL;
QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque)
{
QEMUBH *bh;
bh = qemu_mallocz(sizeof(QEMUBH));
bh->cb = cb;
bh->opaque = opaque;
bh->next = first_bh;
first_bh = bh;
return bh;
}
int qemu_bh_poll(void)
{
QEMUBH *bh, **bhp;
int ret;
ret = 0;
for (bh = first_bh; bh; bh = bh->next) {
if (!bh->deleted && bh->scheduled) {
bh->scheduled = 0;
if (!bh->idle)
ret = 1;
bh->idle = 0;
bh->cb(bh->opaque);
}
}
/* remove deleted bhs */
bhp = &first_bh;
while (*bhp) {
bh = *bhp;
if (bh->deleted) {
*bhp = bh->next;
qemu_free(bh);
} else
bhp = &bh->next;
}
return ret;
}
void qemu_bh_schedule_idle(QEMUBH *bh)
{
if (bh->scheduled)
return;
bh->scheduled = 1;
bh->idle = 1;
}
void qemu_bh_schedule(QEMUBH *bh)
{
if (bh->scheduled)
return;
bh->scheduled = 1;
bh->idle = 0;
/* stop the currently executing CPU to execute the BH ASAP */
qemu_notify_event();
}
void qemu_bh_cancel(QEMUBH *bh)
{
bh->scheduled = 0;
}
void qemu_bh_delete(QEMUBH *bh)
{
bh->scheduled = 0;
bh->deleted = 1;
}
void qemu_bh_update_timeout(int *timeout)
{
QEMUBH *bh;
for (bh = first_bh; bh; bh = bh->next) {
if (!bh->deleted && bh->scheduled) {
if (bh->idle) {
/* idle bottom halves will be polled at least
* every 10ms */
*timeout = MIN(10, *timeout);
} else {
/* non-idle bottom halves will be executed
* immediately */
*timeout = 0;
break;
}
}
}
}

1
qemu-common.h
View File

@ -105,6 +105,7 @@ void qemu_bh_schedule_idle(QEMUBH *bh);
void qemu_bh_cancel(QEMUBH *bh);
void qemu_bh_delete(QEMUBH *bh);
int qemu_bh_poll(void);
void qemu_bh_update_timeout(int *timeout);
uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c);

104
vl.c
View File

@ -3080,110 +3080,6 @@ void qemu_service_io(void)
qemu_notify_event();
}
/***********************************************************/
/* bottom halves (can be seen as timers which expire ASAP) */
struct QEMUBH {
QEMUBHFunc *cb;
void *opaque;
int scheduled;
int idle;
int deleted;
QEMUBH *next;
};
static QEMUBH *first_bh = NULL;
QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque)
{
QEMUBH *bh;
bh = qemu_mallocz(sizeof(QEMUBH));
bh->cb = cb;
bh->opaque = opaque;
bh->next = first_bh;
first_bh = bh;
return bh;
}
int qemu_bh_poll(void)
{
QEMUBH *bh, **bhp;
int ret;
ret = 0;
for (bh = first_bh; bh; bh = bh->next) {
if (!bh->deleted && bh->scheduled) {
bh->scheduled = 0;
if (!bh->idle)
ret = 1;
bh->idle = 0;
bh->cb(bh->opaque);
}
}
/* remove deleted bhs */
bhp = &first_bh;
while (*bhp) {
bh = *bhp;
if (bh->deleted) {
*bhp = bh->next;
qemu_free(bh);
} else
bhp = &bh->next;
}
return ret;
}
void qemu_bh_schedule_idle(QEMUBH *bh)
{
if (bh->scheduled)
return;
bh->scheduled = 1;
bh->idle = 1;
}
void qemu_bh_schedule(QEMUBH *bh)
{
if (bh->scheduled)
return;
bh->scheduled = 1;
bh->idle = 0;
/* stop the currently executing CPU to execute the BH ASAP */
qemu_notify_event();
}
void qemu_bh_cancel(QEMUBH *bh)
{
bh->scheduled = 0;
}
void qemu_bh_delete(QEMUBH *bh)
{
bh->scheduled = 0;
bh->deleted = 1;
}
static void qemu_bh_update_timeout(int *timeout)
{
QEMUBH *bh;
for (bh = first_bh; bh; bh = bh->next) {
if (!bh->deleted && bh->scheduled) {
if (bh->idle) {
/* idle bottom halves will be polled at least
* every 10ms */
*timeout = MIN(10, *timeout);
} else {
/* non-idle bottom halves will be executed
* immediately */
*timeout = 0;
break;
}
}
}
}
/***********************************************************/
/* machine registration */