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authorliuyacan <liuyacan@corp.netease.com>2021-04-25 20:11:30 +0800
committerFlorin Coras <florin.coras@gmail.com>2021-04-26 04:25:40 +0000
commit9f299030fd1214eb1fc076cf0c7f44559a7c8f6b (patch)
tree160e1c524b4e14cfd0c63ae86e9b80a336fc7c50 /docs
parentb14c49d2275f6348640572b7b481dad43f3a00d0 (diff)
session: fix race condition in fifo allocation
Under some timing conditions,VCL may receive CONNECTED/ACCEPTED event before ADD_SEGMENT event. Timing example: 2 threads call segment_manager_alloc_session_fifos() parallelly Thread 1 Thread 2 sm read lock | | | try to alloc fifo =>failed | | | sm read unlock | | | sm write lock | | | add segment | | | sm write unlock | | sm read lock | | | try to alloc fifo=>successful sm read lock | | sm read unlock | | | emit CONNECTED/ACCEPTED emit ADD_SEGMENT event | sm read unlock This commit move ADD_SEGMENT notification under the protection of the write lock in some scenarios. Type: fix Signed-off-by: liuyacan <liuyacan@corp.netease.com> Change-Id: I25d5475c5e6d37cfccefa9506f6030c26ce8ee9b
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