D - Synchronize
Jim Starkey <jas netfrastructure.com> writes:
The synchronize statement/declaration has mutex semantics, which are sub-optimal in a thread environment. A system of two state (shared/ exlusive) locks would allow greater thread concurrency while substantially reducing implementation over head. Although a mutex (exclusive lock) is generally needed to update a cross-thread data structure, only a shared lock is necessary to traverse it. In many applications, the vast majority of access to shared objects can be satisfied with a read lock without blocking other threads also wishing to tranverse the object. A major secondary advantage of locks over mutexes is that a shared lock request uncontested by an exclusive lock can be implented in pure user mode code on multi-processors supporting atomic interlocked instruction, completely bypassing an OS implemented mutex, a huge performance win.
Mar 21 2002
Russ Lewis <spamhole-2001-07-16 deming-os.org> writes:
Hey, welcome to the world of D! I know people haven't responded much (yet), but I wanted to welcome you here. We always need more thoughtful people contributing to this young language! -- The Villagers are Online! villagersonline.com .[ (the fox.(quick,brown)) jumped.over(the dog.lazy) ] .[ (a version.of(English).(precise.more)) is(possible) ] ?[ you want.to(help(develop(it))) ]
Mar 21 2002