4 Commits

Author	SHA1	Message	Date
Bahadir Balban	6c78f149e5	Comments for libl4 userspace mutex implementation has been updated.	2009-06-01 16:36:59 +03:00
Bahadir Balban	33200c92df	Mutex implementation almost working. ... - Fixed a wrong instruction in mutex.S user library - Added support for blocking lock/unlock - Divided waiting into wait_on_prepare and wait_on_prepared_wait so that mutex_control lock is released after getting in the waitqueue. - Declaring waitqueue on the stack should be done outside wait_on_prepare Issues: - Tests can be simplified for atomic data access instead of producer/consumer. - kmalloc variable sized memory caches are not freed properly. Currently only the last slot can be freed, occupied correctly. it should be done in any slot, i.e. 1, 2, 3, 4 instead of just 5. - Need to add a mutex to kmalloc.	2009-06-01 14:11:40 +03:00
Bahadir Balban	ce79aa2b73	Mutex test progress ... - Mutex test added. Forked tasks demonstrate produce/consumer using a shared mmap'ed page. - Added l4lib assembler syscall - Added forgotten SWI to mutex control offset in syscall page. - Added mutex head initialization - Contended child successfully sleeps in a waitqueue. Issues: - Somehow the child's produced page buffer is altered at about [4020] offset. Parent fails to validate buffer therefore. - Need to add syncing to test so that parent does not unlock and lock again before child has a chance to lock buffer and produce.	2009-05-30 16:46:30 +03:00
Bahadir Balban	b11d4c4607	Added mutex_control syscall for userspace mutexes. ... - Compiles and Codezero runs as normal without touching mutex implementation - Mutex implementation needs testing. The mutex control syscall allows userspace programs to declare any virtual address as a mutex lock and ask for help from the kernel syscall for resolving locking contentions.	2009-05-29 15:34:04 +03:00