[M3commit] CVS Update: cm3

[Antony Hosking]

CVSROOT:	/usr/cvs
Changes by:	hosking at birch.	07/11/29 06:07:08

Modified files:
	cm3/m3-libs/libm3/src/os/POSIX/: FSPosix.m3 ProcessPosix.m3 
	cm3/m3-libs/m3core/src/C/Common/: M3toC.m3 
	cm3/m3-libs/m3core/src/runtime/common/: RTAllocCnts.i3 
	                                        RTAllocator.m3 
	                                        RTCollector.m3 
	                                        RTHeapInfo.m3 
	                                        RTHeapRep.i3 
	cm3/m3-libs/m3core/src/thread/Common/: Scheduler.i3 
	cm3/m3-libs/m3core/src/thread/POSIX/: SchedulerPosix.i3 
	                                      ThreadPosix.m3 
	cm3/m3-libs/m3core/src/thread/PTHREAD/: SchedulerPosix.i3 
	                                        ThreadPThread.m3 
	cm3/m3-libs/m3core/src/thread/WIN32/: ThreadWin32.m3 

Log message:
	Move DisableSwitching/EnableSwitching from SchedulerPosix.i3 to Scheduler.i3.
	These need to be available for non-platform-specific code (such as M3toC --
	see below) to disable *user*-level thread switching for non-thread-safe code.
	Since ThreadWin32 and ThreadPThread don't have user-level switching (and library
	routines are system-thread-safe) these operations are no-ops for those targets.
	For ThreadPosix (user-level threads) the operations increment the inCritical
	counter.
	This change permits a bug-fix for M3toC.CopyTtoS, which invoked Cstdlib.malloc
	without any protection against user-level thread switches, making it unsafe for
	user-level threads.
	These changes also permit significant improvement in the allocation sequences
	in RTAllocator.  RTAllocCnts are only enabled now when needed, and locks are
	taken only when counts are enabled.