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体验新版 GitCode,发现更多精彩内容 >>
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c2f30554
编写于
12月 03, 2013
作者:
A
antirez
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blocked.c API commented.
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src/blocked.c
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@@ -26,6 +26,39 @@
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ---------------------------------------------------------------------------
*
* API:
*
* getTimeoutFromObjectOrReply() is just an utility function to parse a
* timeout argument since blocking operations usually require a timeout.
*
* blockClient() set the REDIS_BLOCKED flag in the client, and set the
* specified block type 'btype' filed to one of REDIS_BLOCKED_* macros.
*
* unblockClient() unblocks the client doing the following:
* 1) It calls the btype-specific function to cleanup the state.
* 2) It unblocks the client by unsetting the REDIS_BLOCKED flag.
* 3) It puts the client into a list of just unblocked clients that are
* processed ASAP in the beforeSleep() event loop callback, so that
* if there is some query buffer to process, we do it. This is also
* required because otherwise there is no 'readable' event fired, we
* already read the pending commands. We also set the REDIS_UNBLOCKED
* flag to remember the client is in the unblocked_clients list.
*
* processUnblockedClients() is called inside the beforeSleep() function
* to process the query buffer from unblocked clients and remove the clients
* from the blocked_clients queue.
*
* replyToBlockedClientTimedOut() is called by the cron function when
* a client blocked reaches the specified timeout (if the timeout is set
* to 0, no timeout is processed).
* It usually just needs to send a reply to the client.
*
* When implementing a new type of blocking opeation, the implementation
* should modify unblockClient() and replyToBlockedClientTimedOut() in order
* to handle the btype-specific behavior of this two functions.
*/
#include "redis.h"
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