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192846463a
- Introduce lock classes and lock objects. Each lock class specifies a
name and set of flags (or properties) shared by all locks of a given
type. Currently there are three lock classes: spin mutexes, sleep
mutexes, and sx locks. A lock object specifies properties of an
additional lock along with a lock name and all of the extra stuff needed
to make witness work with a given lock. This abstract lock stuff is
defined in sys/lock.h. The lockmgr constants, types, and prototypes have
been moved to sys/lockmgr.h. For temporary backwards compatability,
sys/lock.h includes sys/lockmgr.h.
- Replace proc->p_spinlocks with a per-CPU list, PCPU(spinlocks), of spin
locks held. By making this per-cpu, we do not have to jump through
magic hoops to deal with sched_lock changing ownership during context
switches.
- Replace proc->p_heldmtx, formerly a list of held sleep mutexes, with
proc->p_sleeplocks, which is a list of held sleep locks including sleep
mutexes and sx locks.
- Add helper macros for logging lock events via the KTR_LOCK KTR logging
level so that the log messages are consistent.
- Add some new flags that can be passed to mtx_init():
- MTX_NOWITNESS - specifies that this lock should be ignored by witness.
This is used for the mutex that blocks a sx lock for example.
- MTX_QUIET - this is not new, but you can pass this to mtx_init() now
and no events will be logged for this lock, so that one doesn't have
to change all the individual mtx_lock/unlock() operations.
- All lock objects maintain an initialized flag. Use this flag to export
a mtx_initialized() macro that can be safely called from drivers. Also,
we on longer walk the all_mtx list if MUTEX_DEBUG is defined as witness
performs the corresponding checks using the initialized flag.
- The lock order reversal messages have been improved to output slightly
more accurate file and line numbers.
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| .. | ||
| pc | ||
| apicreg.h | ||
| asm.h | ||
| asmacros.h | ||
| atomic.h | ||
| bus.h | ||
| bus_amd64.h | ||
| bus_at386.h | ||
| bus_dma.h | ||
| bus_memio.h | ||
| bus_pio.h | ||
| clock.h | ||
| cpu.h | ||
| cpufunc.h | ||
| cputypes.h | ||
| db_machdep.h | ||
| elf.h | ||
| exec.h | ||
| float.h | ||
| floatingpoint.h | ||
| fpu.h | ||
| frame.h | ||
| ieeefp.h | ||
| in_cksum.h | ||
| legacyvar.h | ||
| md_var.h | ||
| mptable.h | ||
| mutex.h | ||
| npx.h | ||
| pcb.h | ||
| pcb_ext.h | ||
| pci_cfgreg.h | ||
| pcpu.h | ||
| pmap.h | ||
| proc.h | ||
| profile.h | ||
| psl.h | ||
| ptrace.h | ||
| reg.h | ||
| reloc.h | ||
| resource.h | ||
| segments.h | ||
| setjmp.h | ||
| sigframe.h | ||
| signal.h | ||
| smp.h | ||
| specialreg.h | ||
| sysarch.h | ||
| trap.h | ||
| tss.h | ||
| ucontext.h | ||
| varargs.h | ||
| vmparam.h | ||