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authorAnand Avati <avati@redhat.com>2012-07-11 16:23:44 -0700
committerAnand Avati <avati@redhat.com>2012-07-13 21:10:48 -0700
commitab44480749a289aaaf78dad4123ef16d1872ea1b (patch)
treeede3a3aa3f248f9a3bd62b0ab3bda701cab3225d /libglusterfs/src
parentaabe0c96cac4d219015a2fe085a7f89ebb9744d1 (diff)
syncop: accomodate non-syncenv calls
Use mutex/cond and support syncop_XXXXXX() calls in non-syncenv environments. syncenv environments continue to use swapcontext based soft context switches. In non-syncenv environments this blocks the caller thread on the mutex. The intended use case is in libgfapi where it is expected to block the caller thread while performing synchronous calls. Change-Id: Id6470c99bdc2fe4b7610372139f7fa99b2da400b BUG: 839950 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.com/3662 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Amar Tumballi <amarts@redhat.com>
Diffstat (limited to 'libglusterfs/src')
-rw-r--r--libglusterfs/src/syncop.c5
-rw-r--r--libglusterfs/src/syncop.h67
2 files changed, 63 insertions, 9 deletions
diff --git a/libglusterfs/src/syncop.c b/libglusterfs/src/syncop.c
index 491f6ae15..7b34c631d 100644
--- a/libglusterfs/src/syncop.c
+++ b/libglusterfs/src/syncop.c
@@ -1015,14 +1015,15 @@ syncop_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
}
int
-syncop_writev (xlator_t *subvol, fd_t *fd, struct iovec *vector,
+syncop_writev (xlator_t *subvol, fd_t *fd, const struct iovec *vector,
int32_t count, off_t offset, struct iobref *iobref,
uint32_t flags)
{
struct syncargs args = {0, };
SYNCOP (subvol, (&args), syncop_writev_cbk, subvol->fops->writev,
- fd, vector, count, offset, flags, iobref, NULL);
+ fd, (struct iovec *) vector, count, offset, flags, iobref,
+ NULL);
errno = args.op_errno;
return args.op_ret;
diff --git a/libglusterfs/src/syncop.h b/libglusterfs/src/syncop.h
index 2db2fb7e8..9f87673d4 100644
--- a/libglusterfs/src/syncop.h
+++ b/libglusterfs/src/syncop.h
@@ -112,22 +112,75 @@ struct syncargs {
/* do not touch */
struct synctask *task;
+ pthread_mutex_t mutex;
+ pthread_cond_t cond;
+ int done;
};
-#define __wake(args) synctask_wake(args->task)
+
+#define __yawn(args) do { \
+ if (!args->task) { \
+ pthread_mutex_init (&args->mutex, NULL); \
+ pthread_cond_init (&args->cond, NULL); \
+ args->done = 0; \
+ } \
+ } while (0)
+
+
+#define __wake(args) do { \
+ if (args->task) { \
+ synctask_wake (args->task); \
+ } else { \
+ pthread_mutex_lock (&args->mutex); \
+ { \
+ args->done = 1; \
+ pthread_cond_signal (&args->cond); \
+ } \
+ pthread_mutex_unlock (&args->mutex); \
+ } \
+ } while (0)
+
+
+#define __yield(args) do { \
+ if (args->task) { \
+ synctask_yield (args->task); \
+ } else { \
+ pthread_mutex_lock (&args->mutex); \
+ { \
+ while (!args->done) \
+ pthread_cond_wait (&args->cond, \
+ &args->mutex); \
+ } \
+ pthread_mutex_unlock (&args->mutex); \
+ pthread_mutex_destroy (&args->mutex); \
+ pthread_cond_destroy (&args->cond); \
+ } \
+ } while (0)
#define SYNCOP(subvol, stb, cbk, op, params ...) do { \
struct synctask *task = NULL; \
+ call_frame_t *frame = NULL; \
\
task = synctask_get (); \
stb->task = task; \
+ if (task) \
+ frame = task->opframe; \
+ else \
+ frame = create_frame (THIS, THIS->ctx->pool); \
+ \
+ __yawn (stb); \
\
- STACK_WIND_COOKIE (task->opframe, cbk, (void *)stb, \
- subvol, op, params); \
- task->state = SYNCTASK_SUSPEND; \
- synctask_yield (stb->task); \
- STACK_RESET (task->opframe->root); \
+ STACK_WIND_COOKIE (frame, cbk, (void *)stb, subvol, \
+ op, params); \
+ if (task) \
+ task->state = SYNCTASK_SUSPEND; \
+ \
+ __yield (stb); \
+ if (task) \
+ STACK_RESET (frame->root); \
+ else \
+ STACK_DESTROY (frame->root); \
} while (0)
@@ -180,7 +233,7 @@ int syncop_close (fd_t *fd);
int syncop_write (xlator_t *subvol, fd_t *fd, const char *buf, int size,
off_t offset, struct iobref *iobref, uint32_t flags);
-int syncop_writev (xlator_t *subvol, fd_t *fd, struct iovec *vector,
+int syncop_writev (xlator_t *subvol, fd_t *fd, const struct iovec *vector,
int32_t count, off_t offset, struct iobref *iobref,
uint32_t flags);
int syncop_readv (xlator_t *subvol, fd_t *fd, size_t size, off_t off,