Changeset 235d31d in mainline for kernel/generic/include/synch/spinlock.h

Timestamp:

2014-12-22T17:47:40Z (9 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

8c7d5ad

Parents:

eae91e0 (diff), 759ea0d (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge the CHT pre-integration branch

This branch contains:

• the merge of lp:~adam-hraska+lp/helenos/rcu, which brings:

• a new preemptible kernel RCU variant called A-RCU,
• a preemptible variant of Podzimek's non-preemptible kernel RCU and
• a new variant of usersace RCU,
• a new concurrent hash table (CHT) implementation based on RCU,
• a deployment of CHT in kernel futex handling,
• a deployment of the userspace RCU in the implementation of upgradable futexes,

all described in Adam Hraska's master thesis named Read-Copy-Update
for HelenOS, defended in 2013 at MFF UK; furthemore, the branch
fixes two synchronization bugs in condvars and waitq, respectively:

• revid:adam.hraska+hos@gmail.com-20121116144921-3to9u1tn1sg07rg7
• revid:adam.hraska+hos@gmail.com-20121116173623-km7gwtqixwudpe66

• build fixes required to pass make check
• overhaul of ia64 and sparc64 trap handling, to allow exc_dispatch() to be used now when the kernel is more picky about CPU state accounting
• an important fix of the sparc64/sun4v preemptible trap handler
• various other fixes of issues discovered on non-x86 architectures

File:

• kernel/generic/include/synch/spinlock.h (modified) (3 diffs)

kernel/generic/include/synch/spinlock.h

@@ -45 +45 @@
 #ifdef CONFIG_SMP
 
-typedef struct {
+typedef struct spinlock {
         atomic_t val;
         
@@ -163 +163 @@
 /* On UP systems, spinlocks are effectively left out. */
 
+/* Allow the use of spinlock_t as an incomplete type. */
+typedef struct spinlock spinlock_t;
+
 #define SPINLOCK_DECLARE(name)
 #define SPINLOCK_EXTERN(name)
@@ -177 +180 @@
 
 #define spinlock_lock(lock)     preemption_disable()
-#define spinlock_trylock(lock)  (preemption_disable(), 1)
+#define spinlock_trylock(lock)  ({ preemption_disable(); 1; })
 #define spinlock_unlock(lock)   preemption_enable()
 #define spinlock_locked(lock)   1