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score: Add local context to SMP lock API

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Add a local context structure to the SMP lock API for acquire and
release pairs.  This context can be used to store the ISR level and
profiling information.  It may be later used to enable more
sophisticated lock algorithms, e.g. MCS locks.

There is only one lock that cannot be used with a local context.  This
is the per-CPU lock since here we would have to transfer the local
context through a context switch which is very complicated.
This commit is contained in:
Sebastian Huber
2014-03-10 08:25:32 +01:00
parent ae88aa7927
commit d50acdbb6c
33 changed files with 480 additions and 329 deletions
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14
cpukit/libblock/src/diskdevs.c
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@@ -435,15 +435,15 @@ rtems_disk_obtain(dev_t dev)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
rtems_disk_device *dd = NULL;
rtems_interrupt_level level;
rtems_interrupt_lock_context lock_context;
rtems_interrupt_lock_acquire(&diskdevs_lock, level);
rtems_interrupt_lock_acquire(&diskdevs_lock, &lock_context);
if (!diskdevs_protected) {
/* Frequent and quickest case */
dd = get_disk_entry(dev, false);
rtems_interrupt_lock_release(&diskdevs_lock, level);
rtems_interrupt_lock_release(&diskdevs_lock, &lock_context);
} else {
rtems_interrupt_lock_release(&diskdevs_lock, level);
rtems_interrupt_lock_release(&diskdevs_lock, &lock_context);
sc = disk_lock();
if (sc == RTEMS_SUCCESSFUL) {
@@ -458,15 +458,15 @@ rtems_disk_obtain(dev_t dev)
rtems_status_code
rtems_disk_release(rtems_disk_device *dd)
{
rtems_interrupt_level level;
rtems_interrupt_lock_context lock_context;
dev_t dev = dd->dev;
unsigned uses = 0;
bool deleted = false;
rtems_interrupt_lock_acquire(&diskdevs_lock, level);
rtems_interrupt_lock_acquire(&diskdevs_lock, &lock_context);
uses = --dd->uses;
deleted = dd->deleted;
rtems_interrupt_lock_release(&diskdevs_lock, level);
rtems_interrupt_lock_release(&diskdevs_lock, &lock_context);
if (uses == 0 && deleted) {
rtems_disk_delete(dev);