diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2017-01-12 19:07:52 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2017-01-16 13:25:17 +0000 |
| commit | 51dee5e465e1b3454a886792ca3e14b851e8e67d (patch) | |
| tree | 33d418609cae2d5251a509cf60dce904dd714bc4 /util/Makefile.objs | |
| parent | cf2c02c8ea0f2d7888f3b45b20e7eb24b47a93f1 (diff) | |
qemu-thread: introduce QemuLockCnt
A QemuLockCnt comprises a counter and a mutex, with primitives
to increment and decrement the counter, and to take and release the
mutex. It can be used to do lock-free visits to a data structure
whenever mutexes would be too heavy-weight and the critical section
is too long for RCU.
This could be implemented simply by protecting the counter with the
mutex, but QemuLockCnt is harder to misuse and more efficient.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170112180800.21085-3-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'util/Makefile.objs')
| -rw-r--r-- | util/Makefile.objs | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/util/Makefile.objs b/util/Makefile.objs index ad0f9c7fe4..c1f247d675 100644 --- a/util/Makefile.objs +++ b/util/Makefile.objs @@ -1,5 +1,6 @@ util-obj-y = osdep.o cutils.o unicode.o qemu-timer-common.o util-obj-y += bufferiszero.o +util-obj-y += lockcnt.o util-obj-$(CONFIG_POSIX) += compatfd.o util-obj-$(CONFIG_POSIX) += event_notifier-posix.o util-obj-$(CONFIG_POSIX) += mmap-alloc.o |