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| author | Paolo Bonzini | 2018-02-03 16:39:32 +0100 |
|---|---|---|
| committer | Fam Zheng | 2018-02-08 02:22:03 +0100 |
| commit | e70372fcaffc99444edce400a5178cb196cddaf7 (patch) | |
| tree | c79196b96035dfb317518b22df44c806017ed79c /include/qemu/thread.h | |
| parent | test-coroutine: add simple CoMutex test (diff) | |
| download | qemu-e70372fcaffc99444edce400a5178cb196cddaf7.tar.gz qemu-e70372fcaffc99444edce400a5178cb196cddaf7.tar.xz qemu-e70372fcaffc99444edce400a5178cb196cddaf7.zip | |
lockable: add QemuLockable
QemuLockable is a polymorphic lock type that takes an object and
knows which function to use for locking and unlocking. The
implementation could use C11 _Generic, but since the support is
not very widespread I am instead using __builtin_choose_expr and
__builtin_types_compatible_p, which are already used by
include/qemu/atomic.h.
QemuLockable can be used to implement lock guards, or to pass around
a lock in such a way that a function can release it and re-acquire it.
The next patch will do this for CoQueue.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20180203153935.8056-3-pbonzini@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Diffstat (limited to 'include/qemu/thread.h')
| -rw-r--r-- | include/qemu/thread.h | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/include/qemu/thread.h b/include/qemu/thread.h index 9af4e945aa..ef7bd16123 100644 --- a/include/qemu/thread.h +++ b/include/qemu/thread.h @@ -4,7 +4,6 @@ #include "qemu/processor.h" #include "qemu/atomic.h" -typedef struct QemuMutex QemuMutex; typedef struct QemuCond QemuCond; typedef struct QemuSemaphore QemuSemaphore; typedef struct QemuEvent QemuEvent; @@ -97,9 +96,9 @@ struct Notifier; void qemu_thread_atexit_add(struct Notifier *notifier); void qemu_thread_atexit_remove(struct Notifier *notifier); -typedef struct QemuSpin { +struct QemuSpin { int value; -} QemuSpin; +}; static inline void qemu_spin_init(QemuSpin *spin) { |