[PATCH v2 04/10] box: don't use box_checkpoint_is_in_progress outside box.cc
Vladimir Davydov
vdavydov.dev at gmail.com
Sat Dec 8 18:48:08 MSK 2018
We only use box_checkpoint_is_in_progress in SIGUSR1 signal handler to
print a warning in case checkpointing cannot be started, because it's
already done by another fiber. Actually, it's not necessary to use it
there - instead we can simply log the error returned by box_checkpoint,
which will be self-explaining ER_CHECKPOINT_IN_PROGRESS in this case.
So let's make box_checkpoint_is_in_progress private to box.cc - this
will simplify moving the checkpoint daemon to the gc module.
While we are at it, remove the unused snapshot_version declaration.
---
src/box/box.cc | 12 ++++++++----
src/box/box.h | 5 -----
src/main.cc | 21 +++++++++++++++------
3 files changed, 23 insertions(+), 15 deletions(-)
diff --git a/src/box/box.cc b/src/box/box.cc
index 036769a9..d146ec16 100644
--- a/src/box/box.cc
+++ b/src/box/box.cc
@@ -87,10 +87,14 @@ static void title(const char *new_status)
systemd_snotify("STATUS=%s", status);
}
-bool box_checkpoint_is_in_progress = false;
const struct vclock *box_vclock = &replicaset.vclock;
/**
+ * Set if there's a fiber performing box_checkpoint() right now.
+ */
+static bool checkpoint_is_in_progress;
+
+/**
* Set if backup is in progress, i.e. box_backup_start() was
* called but box_backup_stop() hasn't been yet.
*/
@@ -2182,11 +2186,11 @@ box_checkpoint()
if (! is_box_configured)
return 0;
int rc = 0;
- if (box_checkpoint_is_in_progress) {
+ if (checkpoint_is_in_progress) {
diag_set(ClientError, ER_CHECKPOINT_IN_PROGRESS);
return -1;
}
- box_checkpoint_is_in_progress = true;
+ checkpoint_is_in_progress = true;
/* create checkpoint files */
latch_lock(&schema_lock);
if ((rc = engine_begin_checkpoint()))
@@ -2206,7 +2210,7 @@ end:
engine_abort_checkpoint();
latch_unlock(&schema_lock);
- box_checkpoint_is_in_progress = false;
+ checkpoint_is_in_progress = false;
/*
* Wait for background garbage collection that might
diff --git a/src/box/box.h b/src/box/box.h
index 7712c192..6de0691d 100644
--- a/src/box/box.h
+++ b/src/box/box.h
@@ -124,11 +124,6 @@ box_wait_ro(bool ro, double timeout);
void
box_set_orphan(bool orphan);
-/** True if snapshot is in progress. */
-extern bool box_checkpoint_is_in_progress;
-/** Incremented with each next snapshot. */
-extern uint32_t snapshot_version;
-
/**
* Iterate over all spaces and save them to the
* snapshot file.
diff --git a/src/main.cc b/src/main.cc
index 6fb0e479..993355ac 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -96,18 +96,27 @@ tarantool_uptime(void)
}
/**
-* Create a checkpoint from signal handler (SIGUSR1)
-*/
+ * Create a checkpoint from signal handler (SIGUSR1)
+ */
+static int
+sig_checkpoint_f(va_list ap)
+{
+ (void)ap;
+ if (box_checkpoint() != 0)
+ diag_log();
+ return 0;
+}
+
static void
sig_checkpoint(ev_loop * /* loop */, struct ev_signal * /* w */,
int /* revents */)
{
- if (box_checkpoint_is_in_progress) {
- say_warn("Checkpoint is already in progress,"
- " the signal is ignored");
+ struct fiber *f = fiber_new("checkpoint", sig_checkpoint_f);
+ if (f == NULL) {
+ say_warn("failed to allocate checkpoint fiber");
return;
}
- fiber_start(fiber_new_xc("checkpoint", (fiber_func)box_checkpoint));
+ fiber_wakeup(f);
}
static void
--
2.11.0
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