https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100806
Bug ID: 100806
Summary: deadlock in std::counting_semaphore
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: gatroubo at squizzy dot net
Target Milestone: ---
Hi,
there seems to be some sort of deadlock in std::counting_semaphore. In the
following test program, I create 10 threads, each thread tries to acquire a
semaphore (initial value 4), waits 100ms, and then releases the semaphore:
https://wandbox.org/permlink/Zt3d4EC5vNOXtr9W
Most of the time, the program seems to be in a deadlock after 5 threads
acquired/released the semaphore. When I compile and run the same code with
clang 11.1 I get the expected behavoir (all 10 threads aquire/release the
semaphore and the program exits successfully):
https://wandbox.org/permlink/XjQaoyy9C6uiDYlo
Thanks for your effort to create such a great tool!
-Tobias
