hurd/gnumach.git - GNU Mach

Age	Commit message (Collapse)	Author
2024-03-27	gsync: Use copyin()/copyout() to access user memory	Sergey Bugaev
	Depending on the architecture and setup, it may not be possible to access user memory directly, for example, due to user mode mappings not being accessible from kernel mode (x86 SMAP, AArch64 PAN). There are dedicated machine-specific copyin()/copyout() routines that know how to access user memory from the kernel; use them. Message-ID: <20240327161841.95685-6-bugaevc@gmail.com>
2024-02-22	kern/gsync: Use vm_map_lookup with keep_map_locked	Damien Zammit
	This prevents a deadlock in smp where a read lock on the map is taken in gsync and then the map is locked again inside vm_map_lookup() but another thread had a pre-existing write lock, therefore the second read lock blocks. This is fixed by removing the initial gsync read lock on the map but keeping the read lock held upon returning from vm_map_lookup(). Co-Authored-By: Sergey Bugaev <bugaevc@gmail.com> Message-ID: <20240222082410.422869-4-damien@zamaudio.com>
2024-02-22	vm_map_lookup: Add parameter for keeping map locked	Damien Zammit
	This adds a parameter called keep_map_locked to vm_map_lookup() that allows the function to return with the map locked. This is to prepare for fixing a bug with gsync where the map is locked twice by mistake. Co-Authored-By: Sergey Bugaev <bugaevc@gmail.com> Message-ID: <20240222082410.422869-3-damien@zamaudio.com>
2019-08-11	Fix uninitialized value	Samuel Thibault
	* kern/gsync.c (temp_mapping): Initialize start address to VM_MIN_KERNEL_ADDRESS.
2017-03-04	Rewrite gsync so that it works with remote tasks v2	Agustina Arzille

2016-11-10	gsync: Avoid NULL pointer dereference	Brent Baccala
	* kern/gsync.c (gsync_wait, gsync_wake, gsync_requeue): Return immediately if task argument is TASK_NULL
2016-10-31	gsync: fix licence	Samuel Thibault
	Agustina relicenced her work. * kern/gsync.c: Relicence to GPL 2+. * kern/gsync.h: Relicence to GPL 2+.
2016-10-31	gsync: Fix crash when task is not current task	Samuel Thibault
	* kern/gsync.c (gsync_wait, gsync_wake, gsync_requeue): Return KERN_FAILURE when task != current_task().
2016-10-31	gsync: Fix assertion failure with MACH_LDEBUG	Samuel Thibault
	vm_map_lock_read calls check_simple_locks(), so we need to lock hbp after taking the vm_map read lock. * kern/gsync.c (gsync_wait): Call vm_map_lock_read before locking &hbp->lock. (gsync_wake): Likewise.
2016-04-17	Avoid using C99 for variable declaration for now	Samuel Thibault
	* kern/gsync.c (gsync_setup): Declare `i' variable out of for loop.
2016-04-15	Lightweight synchronization mechanism	Agustina Arzille
	* Makefrag.am (libkernel_a_SOURCES): Add kern/gsync.c and kern/gsync.h. * include/mach/gnumach.defs (gsync_wait, gsync_wake, gsync_requeue): New routines. * include/mach/kern_return.h (KERN_TIMEDOUT, KERN_INTERRUPTED): New error codes. * kern/gsync.c: New file. * kern/gsync.h: New file. * kern/startup.c: Include <kern/gsync.h> (setup_main): Call gsync_setup.