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* gsync: Use copyin()/copyout() to access user memorySergey Bugaev2024-03-271-7/+31
| | | | | | | | | 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>
* kern/gsync: Use vm_map_lookup with keep_map_lockedDamien Zammit2024-02-221-13/+6
| | | | | | | | | | | | | 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>
* vm_map_lookup: Add parameter for keeping map lockedDamien Zammit2024-02-221-1/+1
| | | | | | | | | | | 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>
* Fix uninitialized valueSamuel Thibault2019-08-111-1/+1
| | | | | * kern/gsync.c (temp_mapping): Initialize start address to VM_MIN_KERNEL_ADDRESS.
* Rewrite gsync so that it works with remote tasks v2Agustina Arzille2017-03-041-138/+230
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* gsync: Avoid NULL pointer dereferenceBrent Baccala2016-11-101-9/+12
| | | | | * kern/gsync.c (gsync_wait, gsync_wake, gsync_requeue): Return immediately if task argument is TASK_NULL
* gsync: fix licenceSamuel Thibault2016-10-311-1/+1
| | | | | | | Agustina relicenced her work. * kern/gsync.c: Relicence to GPL 2+. * kern/gsync.h: Relicence to GPL 2+.
* gsync: Fix crash when task is not current taskSamuel Thibault2016-10-311-0/+9
| | | | | * kern/gsync.c (gsync_wait, gsync_wake, gsync_requeue): Return KERN_FAILURE when task != current_task().
* gsync: Fix assertion failure with MACH_LDEBUGSamuel Thibault2016-10-311-5/+5
| | | | | | | | | 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.
* Avoid using C99 for variable declaration for nowSamuel Thibault2016-04-171-1/+2
| | | | * kern/gsync.c (gsync_setup): Declare `i' variable out of for loop.
* Lightweight synchronization mechanismAgustina Arzille2016-04-151-0/+412
* 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.
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