| commit | 8a18d5b12d97994512eb8cf90665e94bad8df103 | |
| author | Jakub Jermar <jakub@jermar.eu> | |
| Sat, 10 Nov 2018 16:22:29 +0000 (10 17:22 +0100) | ||
| committer | Jakub Jermar <jakub@jermar.eu> | |
| Sun, 11 Nov 2018 15:47:39 +0000 (11 16:47 +0100) | ||
| tree | dce1104c7986ba28e82f6db3907f970bb6793cfe | treesnapshot (tar.gz zip) |
| parent | 0b5203bfbdafa8ef8abc2bd7521c6fd282f677e9 | commitdiff |
Preallocate the waitq handle
This fixes a race condition (a missing wakeup) when the wakeup was
faster than the thread going to sleep and no handle was allocated yet.
The handle get preallocated to avoid a possible allocation failure in
wakeup.
We also switched to using atomic_compare_exchange_weak_explicit() to fix
ARMv4 and ARMv5 builds.
This fixes a race condition (a missing wakeup) when the wakeup was
faster than the thread going to sleep and no handle was allocated yet.
The handle get preallocated to avoid a possible allocation failure in
wakeup.
We also switched to using atomic_compare_exchange_weak_explicit() to fix
ARMv4 and ARMv5 builds.
| uspace/lib/c/generic/private/futex.h | diffblobblamehistory | |
| uspace/lib/c/generic/thread/futex.c | diffblobblamehistory |