From 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 Mon Sep 17 00:00:00 2001 From: Zack Weinberg Date: Thu, 8 Jun 2017 15:39:03 -0400 Subject: Prepare for radical source tree reorganization. All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control). --- REORG.TODO/nptl/TODO | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 REORG.TODO/nptl/TODO (limited to 'REORG.TODO/nptl/TODO') diff --git a/REORG.TODO/nptl/TODO b/REORG.TODO/nptl/TODO new file mode 100644 index 0000000000..70b8fe4f76 --- /dev/null +++ b/REORG.TODO/nptl/TODO @@ -0,0 +1,31 @@ +- we should probably extend pthread_mutexattr_t with a field to create a + single linked list of all instances. This requires changing the + pthread_mutexattr_* functions. + + +- a new attribute for mutexes: number of times we spin before calling +sys_futex + +- for adaptive mutexes: when releasing, determine whether somebody spins. +If yes, for a short time release lock. If someone else locks no wakeup +syscall needed. + + + +- test with threaded process terminating and semadj (?) being applied + only after all threads are gone + + + +- semaphore changes: + + - sem_post should only wake one thread and only when the state of + the semaphore changed from 0 to 1 + + this also requires that sem_wait and sem_timedwait don't drop the + post if they get canceled. + + - possibly add counter field. This requires reviving the + differences between old and new semaphose funtions. The old ones + stay as they are now. The new once can use an additional field + wich is the counter for the number of waiters -- cgit 1.4.1