Mike Habicher於 2013年10月23日星期三UTC+8上午4時14分07秒寫道： > Ref. Hal.cpp[0] > > > > Each b2g process (parent or app) has a Main Thread[1]. These processes > > will have other threads as well, but many operations (such as layout, > > JS, and DOM) must take place on the Main Thread because they are not > > threadsafe. To make functions robust against being called from the wrong > > thread, it's common to use the following: > > MOZ_ASSERT(NS_IsMainThread()); > > > > NS_IsMainThread()[2] returns true if the currently executing thread is > > the Main Thread; and in DEBUG builds, MOZ_ASSERT()[3] will cause the > > current process to crash if its condition is false. > > > > In Hal.cpp, this assertion is just wrapped up into a simple function. > > > > --m. > > > > > > 0. http://mxr.mozilla.org/mozilla-central/source/hal/Hal.cpp#76 > > 1. > > https://developer.mozilla.org/en-US/docs/XPCOM/Making_cross-thread_calls_using_runnables > > 2. > > http://mxr.mozilla.org/mozilla-central/source/xpcom/glue/MainThreadUtils.h#35 > > 3. http://mxr.mozilla.org/mozilla-central/source/mfbt/Assertions.h#318 > > > > On 13-10-22 03:47 PM, [email protected] wrote: > > > I noticed that in the Hal.cpp (gecko/hal/), there is always a function > > named AssertMainThread(); got called in the first line of each function. > > Such as SetTimezone or EnableSensorNotification. > > > > > > Can anyone explain this a bit why this function always there and how it > > works? > > > > > > Thanks > > > _______________________________________________ > > > dev-b2g mailing list > > > [email protected] > > > https://lists.mozilla.org/listinfo/dev-b2g
Thanks Mike. This is very clear. _______________________________________________ dev-b2g mailing list [email protected] https://lists.mozilla.org/listinfo/dev-b2g
