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/*
* Helper functionality for distributing a fixed total amount of
* an abstract resource among multiple coroutines.
*
* Copyright (c) 2022 Virtuozzo International GmbH
*
* 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/osdep.h"
#include "qemu/coroutine.h"
#include "block/aio.h"
typedef struct QemuCoTimeoutState {
CoroutineEntry *entry;
void *opaque;
QemuCoSleep sleep_state;
bool marker;
CleanupFunc *clean;
} QemuCoTimeoutState;
static void coroutine_fn qemu_co_timeout_entry(void *opaque)
{
QemuCoTimeoutState *s = opaque;
s->entry(s->opaque);
if (s->marker) {
assert(!s->sleep_state.to_wake);
/* .marker set by qemu_co_timeout, it have been failed */
if (s->clean) {
s->clean(s->opaque);
}
g_free(s);
} else {
s->marker = true;
qemu_co_sleep_wake(&s->sleep_state);
}
}
int coroutine_fn qemu_co_timeout(CoroutineEntry *entry, void *opaque,
uint64_t timeout_ns, CleanupFunc clean)
{
QemuCoTimeoutState *s;
Coroutine *co;
if (timeout_ns == 0) {
entry(opaque);
return 0;
}
s = g_new(QemuCoTimeoutState, 1);
*s = (QemuCoTimeoutState) {
.entry = entry,
.opaque = opaque,
.clean = clean
};
co = qemu_coroutine_create(qemu_co_timeout_entry, s);
aio_co_enter(qemu_get_current_aio_context(), co);
qemu_co_sleep_ns_wakeable(&s->sleep_state, QEMU_CLOCK_REALTIME, timeout_ns);
if (s->marker) {
/* .marker set by qemu_co_timeout_entry, success */
g_free(s);
return 0;
}
/* Don't free s, as we can't cancel qemu_co_timeout_entry execution */
s->marker = true;
return -ETIMEDOUT;
}
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