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add a couple of macros for memory page alignment

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1742 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2007-09-02 20:34:57 +00:00
parent 1df817cb0a
commit fe1f55b877
1 changed files with 25 additions and 1 deletions
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26
src/pulsecore/macro.h
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@ -25,15 +25,39 @@
***/
#include <sys/types.h>
#include <unistd.h>
#include <assert.h>
#include <limits.h>
#include <unistd.h>
#include <pulsecore/log.h>
#if defined(PAGE_SIZE)
#define PA_PAGE_SIZE ((size_t) PAGE_SIZE)
#elif defined(PAGESIZE)
#define PA_PAGE_SIZE ((size_t) PAGESIZE)
#elif defined(HAVE_SYSCONF)
#define PA_PAGE_SIZE ((size_t) (sysconf(_SC_PAGE_SIZE)))
#else
/* Let's hope it's like x86. */
#define PA_PAGE_SIZE ((size_t) 4096)
#endif
static inline size_t pa_align(size_t l) {
return (((l + sizeof(void*) - 1) / sizeof(void*)) * sizeof(void*));
}
#define PA_ALIGN(x) (pa_align(x))
static inline void* pa_page_align_ptr(const void *p) {
return (void*) (((size_t) p) & ~(PA_PAGE_SIZE-1));
}
#define PA_PAGE_ALIGN_PTR(x) (pa_page_align_ptr(x))
static inline size_t pa_page_align(size_t l) {
return l & ~(PA_PAGE_SIZE-1);
}
#define PA_PAGE_ALIGN(x) (pa_page_align(x))
#define PA_ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
#define SA_MAX(a, b) ((a) > (b) ? (a) : (b))