diff -r 5072524fcc79 -r 80ef3a206772 Symbian3/PDK/Source/GUID-EAA6A9FB-A470-550C-B7B4-FF68A733A2D5.dita --- a/Symbian3/PDK/Source/GUID-EAA6A9FB-A470-550C-B7B4-FF68A733A2D5.dita Fri Jul 02 12:51:36 2010 +0100 +++ b/Symbian3/PDK/Source/GUID-EAA6A9FB-A470-550C-B7B4-FF68A733A2D5.dita Fri Jul 16 17:23:46 2010 +0100 @@ -88,7 +88,7 @@ already have the kernel lock, or in the case of IDFCs, you do not need to acquire it as no preemption can occur. In these cases, you just call NFastMutex::Wait() and NFastMutex::Signal().

The following diagram illustrates the general principle:

Fast mutex - +

There are a number of assumptions here, one of which is that the priorities are such that thread T1 does not run until a reschedule occurs, after T2 has been interrupted.

Example @@ -489,7 +489,7 @@ somewhat artificial, and not based on real code, the following diagram nevertheless shows the basic idea behind Symbian platform semaphores.

Symbian platform semaphore - +

Rules

There are a few rules about the use of Symbian platform semaphores: