Add new API, to make a time limited call of the coroutine.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
---
include/qemu/coroutine.h | 13 ++++++
util/qemu-co-timeout.c | 89 ++++++++++++++++++++++++++++++++++++++++
util/meson.build | 1 +
3 files changed, 103 insertions(+)
create mode 100644 util/qemu-co-timeout.c
diff --git a/include/qemu/coroutine.h b/include/qemu/coroutine.h
index c828a95ee0..8704b05da8 100644
--- a/include/qemu/coroutine.h
+++ b/include/qemu/coroutine.h
@@ -316,6 +316,19 @@ static inline void coroutine_fn
qemu_co_sleep_ns(QEMUClockType type, int64_t ns)
qemu_co_sleep_ns_wakeable(&w, type, ns);
}
+typedef void CleanupFunc(void *opaque);
+/**
+ * Run entry in a coroutine and start timer. Wait for entry to finish or for
+ * timer to elapse, what happen first. If entry finished, return 0, if timer
+ * elapsed earlier, return -ETIMEDOUT.
+ *
+ * Be careful, entry execution is not canceled, user should handle it somehow.
+ * If @clean is provided, it's called after coroutine finish if timeout
+ * happened.
+ */
+int coroutine_fn qemu_co_timeout(CoroutineEntry *entry, void *opaque,
+ uint64_t timeout_ns, CleanupFunc clean);
+
/**
* Wake a coroutine if it is sleeping in qemu_co_sleep_ns. The timer will be
* deleted. @sleep_state must be the variable whose address was given to
diff --git a/util/qemu-co-timeout.c b/util/qemu-co-timeout.c
new file mode 100644
index 0000000000..00cd335649
--- /dev/null
+++ b/util/qemu-co-timeout.c
@@ -0,0 +1,89 @@
+/*
+ * 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;
+}
diff --git a/util/meson.build b/util/meson.build
index 3736988b9f..44392e89a4 100644
--- a/util/meson.build
+++ b/util/meson.build
@@ -82,6 +82,7 @@ if have_block
util_ss.add(files('block-helpers.c'))
util_ss.add(files('qemu-coroutine-sleep.c'))
util_ss.add(files('qemu-co-shared-resource.c'))
+ util_ss.add(files('qemu-co-timeout.c'))
util_ss.add(files('thread-pool.c', 'qemu-timer.c'))
util_ss.add(files('readline.c'))
util_ss.add(files('throttle.c'))
--
2.31.1
