prevent race conditions with uvwasi_fd_close() #91
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bnoordhuis
approved these changes
Jan 22, 2020
uvwasi_fd_close() performed the following operations: - lock the file descriptor mutex - close the file - release the file descriptor mutex - call the file table's remove() function Once the fd's mutex is released, another thread could acquire it before the fd is removed from the file table. If this happens, remove() could destroy a held mutex. This commit updates uvwasi_fd_close() to perform the entire sequence while holding the file table's lock, preventing new acquisitions of the fd's mutex. Fixes: #88
This was referenced Mar 14, 2020
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This depends on #90 (the first commit in this PR).
uvwasi_fd_close()performed the following operations:remove()functionOnce the fd's mutex is released, another thread could acquire it
before the fd is removed from the file table. If this happens,
remove()could destroy a held mutex.This commit updates
uvwasi_fd_close()to perform the entiresequence while holding the file table's lock, preventing new
acquisitions of the fd's mutex.
Fixes: #88