Sync SDL3 wiki -> header

This commit is contained in:
SDL Wiki Bot 2024-04-24 20:43:29 +00:00
parent cdb3cea76d
commit ceeefb0512
1 changed files with 22 additions and 22 deletions

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@ -65,21 +65,20 @@ extern "C" {
/**
* An atomic spinlock.
*
* The atomic locks are efficient spinlocks using CPU instructions,
* but are vulnerable to starvation and can spin forever if a thread
* holding a lock has been terminated. For this reason you should
* minimize the code executed inside an atomic lock and never do
* expensive things like API or system calls while holding them.
* The atomic locks are efficient spinlocks using CPU instructions, but are
* vulnerable to starvation and can spin forever if a thread holding a lock
* has been terminated. For this reason you should minimize the code executed
* inside an atomic lock and never do expensive things like API or system
* calls while holding them.
*
* They are also vulnerable to starvation if the thread holding
* the lock is lower priority than other threads and doesn't get
* scheduled. In general you should use mutexes instead, since
* they have better performance and contention behavior.
* They are also vulnerable to starvation if the thread holding the lock is
* lower priority than other threads and doesn't get scheduled. In general you
* should use mutexes instead, since they have better performance and
* contention behavior.
*
* The atomic locks are not safe to lock recursively.
*
* Porting Note:
* The spin lock functions and type are required and can not be
* Porting Note: The spin lock functions and type are required and can not be
* emulated because they are used in the atomic emulation code.
*/
typedef int SDL_SpinLock;
@ -264,11 +263,12 @@ typedef void (*SDL_KernelMemoryBarrierFunc)();
/* "REP NOP" is PAUSE, coded for tools that don't know it by that name. */
#ifdef SDL_WIKI_DOCUMENTATION_SECTION
/**
* A macro to insert a CPU-specific "pause" instruction into the program.
*
* This can be useful in busy-wait loops, as it serves as a hint to the CPU
* as to the program's intent; some CPUs can use this to do more efficient
* This can be useful in busy-wait loops, as it serves as a hint to the CPU as
* to the program's intent; some CPUs can use this to do more efficient
* processing. On some platforms, this doesn't do anything, so using this
* macro might just be a harmless no-op.
*
@ -309,16 +309,16 @@ typedef void (*SDL_KernelMemoryBarrierFunc)();
* all other threads, regardless of the CPU it is running on, will see that
* value when retrieved with SDL_AtomicGet, regardless of CPU caches, etc.
*
* This is also useful for atomic compare-and-swap operations: a thread
* can change the value as long as its current value matches expectations.
* When done in a loop, one can guarantee data consistency across threads
* without a lock (but the usual warnings apply: if you don't know what
* you're doing, or you don't do it carefully, you can confidently cause
* any number of disasters with this, so in most cases, you _should_
* use a mutex instead of this!).
* This is also useful for atomic compare-and-swap operations: a thread can
* change the value as long as its current value matches expectations. When
* done in a loop, one can guarantee data consistency across threads without a
* lock (but the usual warnings apply: if you don't know what you're doing, or
* you don't do it carefully, you can confidently cause any number of
* disasters with this, so in most cases, you _should_ use a mutex instead of
* this!).
*
* This is a struct so people don't accidentally use numeric operations on
* it directly. You have to use SDL_Atomic* functions.
* This is a struct so people don't accidentally use numeric operations on it
* directly. You have to use SDL_Atomic* functions.
*
* \since This struct is available since SDL 3.0.0.
*