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MINOR: compiler: add ALWAYS_PAD() macro

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same as THREAD_PAD() but doesn't depend on haproxy being compiled with
thread support. It may be useful for memory (or files) that may be
shared between multiple processed.
This commit is contained in:
Aurelien DARRAGON 2025-09-03 15:23:00 +02:00
parent cf2562cddf
commit 46a5948ed2
1 changed files with 15 additions and 2 deletions
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17
include/haproxy/compiler.h
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@ -488,20 +488,33 @@
#endif
#endif
/* add padding of the specified size */
#define _PAD(x,l) char __pad_##l[x]
/* add optional padding of the specified size between fields in a structure,
* only when threads are enabled. This is used to avoid false sharing of cache
* lines for dynamically allocated structures which cannot guarantee alignment.
*/
#ifndef THREAD_PAD
# ifdef USE_THREAD
# define __THREAD_PAD(x,l) char __pad_##l[x]
# define _THREAD_PAD(x,l) __THREAD_PAD(x, l)
# define _THREAD_PAD(x,l) _PAD(x, l)
# define THREAD_PAD(x) _THREAD_PAD(x, __LINE__)
# else
# define THREAD_PAD(x)
# endif
#endif
/* add mandatory padding of the specified size between fields in a structure,
* This is used to avoid false sharing of cache lines for dynamically allocated
* structures which cannot guarantee alignment, or to ensure that the size of
* the struct remains consistent on architectures with different aligment
* constraints
*/
#ifndef ALWAYS_PAD
# define _ALWAYS_PAD(x,l) _PAD(x, l)
# define ALWAYS_PAD(x) _ALWAYS_PAD(x, __LINE__)
#endif
/* The THREAD_LOCAL type attribute defines thread-local storage and is defined
* to __thread when threads are enabled or empty when disabled.
*/