Author: marius
Date: Tue Nov 15 20:17:18 2011
New Revision: 227539
URL: http://svn.freebsd.org/changeset/base/227539
Log:
Define curthread as an inline function that loads the thread pointer
directly from g7, the pcpu pointer. This guarantees correct behavior
when the thread migrates to a different CPU.
Commit message stolen from r205431. Additional testing by Peter Jeremy.
MFC after: 3 days
Modified:
head/sys/sparc64/include/pcpu.h
Modified: head/sys/sparc64/include/pcpu.h
==============================================================================
--- head/sys/sparc64/include/pcpu.h Tue Nov 15 20:15:58 2011
(r227538)
+++ head/sys/sparc64/include/pcpu.h Tue Nov 15 20:17:18 2011
(r227539)
@@ -74,6 +74,16 @@ register struct pcpu *pcpup __asm__(__XS
#define PCPU_GET(member) (pcpup->pc_ ## member)
+static __inline __pure2 struct thread *
+__curthread(void)
+{
+ struct thread *td;
+
+ __asm("ldx [%" __XSTRING(PCPU_REG) "], %0" : "=r" (td));
+ return (td);
+}
+#define curthread (__curthread())
+
/*
* XXX The implementation of this operation should be made atomic
* with respect to preemption.
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