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Add atomic_sub_* functions to libspl.

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Both the SPL and the ZFS libspl export most of the atomic_* functions,
except atomic_sub_* functions which are only exported by the SPL, not by
libspl. This patch remedies that by implementing atomic_sub_* functions
in libspl.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1013
This commit is contained in:
Etienne Dechamps
2012-06-27 10:26:49 +02:00
committed by Brian Behlendorf
parent 82f46731fd
commit 142e6dd100
4 changed files with 284 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/libspl/asm-generic/atomic.c
+56
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@@ -103,6 +103,31 @@ void atomic_add_ptr(volatile void *target, ssize_t bits)
}
#define ATOMIC_SUB(name, type1, type2) \
void atomic_sub_##name(volatile type1 *target, type2 bits) \
{ \
VERIFY3S(pthread_mutex_lock(&atomic_lock), ==, 0); \
*target -= bits; \
VERIFY3S(pthread_mutex_unlock(&atomic_lock), ==, 0); \
}
ATOMIC_SUB(8, uint8_t, int8_t)
ATOMIC_SUB(char, uchar_t, signed char)
ATOMIC_SUB(16, uint16_t, int16_t)
ATOMIC_SUB(short, ushort_t, short)
ATOMIC_SUB(32, uint32_t, int32_t)
ATOMIC_SUB(int, uint_t, int)
ATOMIC_SUB(long, ulong_t, long)
ATOMIC_SUB(64, uint64_t, int64_t)
void atomic_sub_ptr(volatile void *target, ssize_t bits)
{
VERIFY3S(pthread_mutex_lock(&atomic_lock), ==, 0);
*(caddr_t *)target -= bits;
VERIFY3S(pthread_mutex_unlock(&atomic_lock), ==, 0);
}
#define ATOMIC_OR(name, type) \
void atomic_or_##name(volatile type *target, type bits) \
{ \
@@ -216,6 +241,37 @@ void *atomic_add_ptr_nv(volatile void *target, ssize_t bits)
}
#define ATOMIC_SUB_NV(name, type1, type2) \
type1 atomic_sub_##name##_nv(volatile type1 *target, type2 bits)\
{ \
type1 rc; \
VERIFY3S(pthread_mutex_lock(&atomic_lock), ==, 0); \
rc = (*target -= bits); \
VERIFY3S(pthread_mutex_unlock(&atomic_lock), ==, 0); \
return rc; \
}
ATOMIC_SUB_NV(8, uint8_t, int8_t)
ATOMIC_SUB_NV(char, uchar_t, signed char)
ATOMIC_SUB_NV(16, uint16_t, int16_t)
ATOMIC_SUB_NV(short, ushort_t, short)
ATOMIC_SUB_NV(32, uint32_t, int32_t)
ATOMIC_SUB_NV(int, uint_t, int)
ATOMIC_SUB_NV(long, ulong_t, long)
ATOMIC_SUB_NV(64, uint64_t, int64_t)
void *atomic_sub_ptr_nv(volatile void *target, ssize_t bits)
{
void *ptr;
VERIFY3S(pthread_mutex_lock(&atomic_lock), ==, 0);
ptr = (*(caddr_t *)target -= bits);
VERIFY3S(pthread_mutex_unlock(&atomic_lock), ==, 0);
return ptr;
}
#define ATOMIC_OR_NV(name, type) \
type atomic_or_##name##_nv(volatile type *target, type bits) \
{ \