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kernel: atomic_*() functions rework

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* No need for the atomically changed variables to be declared as
   volatile.
 * Drop support for atomically getting and setting unaligned data.
 * Introduce atomic_get_and_set[64]() which works the same as
   atomic_set[64]() used to. atomic_set[64]() does not return the
   previous value anymore.
This commit is contained in:
Pawel Dziepak
2013-11-05 22:32:59 +01:00
parent e7dba861fd
commit 077c84eb27
47 changed files with 360 additions and 253 deletions
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headers/os/drivers/KernelExport.h
+4 -4
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@@ -20,9 +20,9 @@ typedef ulong cpu_status;
#if B_DEBUG_SPINLOCK_CONTENTION
typedef struct {
vint32 lock;
vint32 count_low;
vint32 count_high;
int32 lock;
int32 count_low;
int32 count_high;
} spinlock;
# define B_SPINLOCK_INITIALIZER { 0, 0, 0 }
@@ -33,7 +33,7 @@ typedef ulong cpu_status;
} while (false)
# define B_SPINLOCK_IS_LOCKED(spinlock) ((spinlock)->lock > 0)
#else
typedef vint32 spinlock;
typedef int32 spinlock;
# define B_SPINLOCK_INITIALIZER 0
# define B_INITIALIZE_SPINLOCK(lock) do { *(lock) = 0; } while (false)