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Removed the nanosecond versions of event and thread primitive waits from the public API

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It's not clear applications need this level of precision yet, so let's leave these private for now.
This commit is contained in:
Sam Lantinga 2022-12-02 08:29:46 -08:00
parent e2432bbd3b
commit 1f4cc733a1
6 changed files with 17 additions and 109 deletions
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3
WhatsNew.txt
View file

@ -35,7 +35,4 @@ General:
* SDL_GetTicks() now returns a 64-bit value and the tick values should be directly compared instead of using the SDL_TICKS_PASSED macro
* Added SDL_GetTicksNS() to return the number of nanoseconds since the SDL library initialized
* Added SDL_DelayNS() to specify a delay in nanoseconds, to the highest precision the system will support
* Added SDL_WaitEventTimeoutNS() to wait for events with the highest possible precision
* Added SDL_SemWaitTimeoutNS() to wait for a semaphore with the highest possible precision
* Added SDL_CondWaitTimeoutNS() to wait for a condition variable the highest possible precision
* The timestamp member of the SDL_Event structure is now in nanoseconds, filled in with SDL_GetTicksNS()

33
include/SDL3/SDL_events.h
View file

@ -879,7 +879,6 @@ extern DECLSPEC void SDLCALL SDL_FlushEvents(Uint32 minType, Uint32 maxType);
* \sa SDL_SetEventFilter
* \sa SDL_WaitEvent
* \sa SDL_WaitEventTimeout
* \sa SDL_WaitEventTimeoutNS
*/
extern DECLSPEC int SDLCALL SDL_PollEvent(SDL_Event * event);
@ -902,7 +901,6 @@ extern DECLSPEC int SDLCALL SDL_PollEvent(SDL_Event * event);
* \sa SDL_PollEvent
* \sa SDL_PumpEvents
* \sa SDL_WaitEventTimeout
* \sa SDL_WaitEventTimeoutNS
*/
extern DECLSPEC int SDLCALL SDL_WaitEvent(SDL_Event *event);
@ -932,40 +930,9 @@ extern DECLSPEC int SDLCALL SDL_WaitEvent(SDL_Event *event);
* \sa SDL_PollEvent
* \sa SDL_PumpEvents
* \sa SDL_WaitEvent
* \sa SDL_WaitEventTimeoutNS
*/
extern DECLSPEC int SDLCALL SDL_WaitEventTimeout(SDL_Event *event, Sint32 timeoutMS);
/**
* Wait until the specified timeout (in nanoseconds) for the next available
* event.
*
* If `event` is not NULL, the next event is removed from the queue and stored
* in the SDL_Event structure pointed to by `event`.
*
* As this function may implicitly call SDL_PumpEvents(), you can only call
* this function in the thread that initialized the video subsystem.
*
* The timeout is not guaranteed, the actual wait time could be longer
* due to system scheduling.
*
* \param event the SDL_Event structure to be filled in with the next event
* from the queue, or NULL
* \param timeoutNS the maximum number of nanoseconds to wait for the next
* available event
* \returns 1 on success or 0 if there was an error while waiting for events;
* call SDL_GetError() for more information. This also returns 0 if
* the timeout elapsed without an event arriving.
*
* \since This function is available since SDL 3.0.0.
*
* \sa SDL_PollEvent
* \sa SDL_PumpEvents
* \sa SDL_WaitEvent
* \sa SDL_WaitEventTimeout
*/
extern DECLSPEC int SDLCALL SDL_WaitEventTimeoutNS(SDL_Event *event, Sint64 timeoutNS);
/**
* Add an event to the event queue.
*

67
include/SDL3/SDL_mutex.h
View file

@ -194,7 +194,6 @@ typedef struct SDL_semaphore SDL_sem;
* \sa SDL_SemValue
* \sa SDL_SemWait
* \sa SDL_SemWaitTimeout
* \sa SDL_SemWaitTimeoutNS
*/
extern DECLSPEC SDL_sem *SDLCALL SDL_CreateSemaphore(Uint32 initial_value);
@ -214,7 +213,6 @@ extern DECLSPEC SDL_sem *SDLCALL SDL_CreateSemaphore(Uint32 initial_value);
* \sa SDL_SemValue
* \sa SDL_SemWait
* \sa SDL_SemWaitTimeout
* \sa SDL_SemWaitTimeoutNS
*/
extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem);
@ -242,7 +240,6 @@ extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem);
* \sa SDL_SemValue
* \sa SDL_SemWait
* \sa SDL_SemWaitTimeout
* \sa SDL_SemWaitTimeoutNS
*/
extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem);
@ -267,7 +264,6 @@ extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem);
* \sa SDL_SemValue
* \sa SDL_SemWait
* \sa SDL_SemWaitTimeout
* \sa SDL_SemWaitTimeoutNS
*/
extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem);
@ -293,36 +289,9 @@ extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem);
* \sa SDL_SemTryWait
* \sa SDL_SemValue
* \sa SDL_SemWait
* \sa SDL_SemWaitTimeoutNS
*/
extern DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Sint32 timeoutMS);
/**
* Wait until a semaphore has a positive value and then decrements it.
*
* This function suspends the calling thread until either the semaphore
* pointed to by `sem` has a positive value, the call is interrupted by a
* signal or error, or the specified time has elapsed. If the call is
* successful it will atomically decrement the semaphore value.
*
* \param sem the semaphore to wait on
* \param timeoutNS the length of the timeout, in nanoseconds
* \returns 0 if the wait succeeds, `SDL_MUTEX_TIMEDOUT` if the wait does not
* succeed in the allotted time, or a negative error code on failure;
* call SDL_GetError() for more information.
*
* \since This function is available since SDL 3.0.0.
*
* \sa SDL_CreateSemaphore
* \sa SDL_DestroySemaphore
* \sa SDL_SemPost
* \sa SDL_SemTryWait
* \sa SDL_SemValue
* \sa SDL_SemWait
* \sa SDL_SemWaitTimeout
*/
extern DECLSPEC int SDLCALL SDL_SemWaitTimeoutNS(SDL_sem *sem, Sint64 timeoutNS);
/**
* Atomically increment a semaphore's value and wake waiting threads.
*
@ -377,7 +346,6 @@ typedef struct SDL_cond SDL_cond;
* \sa SDL_CondSignal
* \sa SDL_CondWait
* \sa SDL_CondWaitTimeout
* \sa SDL_CondWaitTimeoutNS
* \sa SDL_DestroyCond
*/
extern DECLSPEC SDL_cond *SDLCALL SDL_CreateCond(void);
@ -393,7 +361,6 @@ extern DECLSPEC SDL_cond *SDLCALL SDL_CreateCond(void);
* \sa SDL_CondSignal
* \sa SDL_CondWait
* \sa SDL_CondWaitTimeout
* \sa SDL_CondWaitTimeoutNS
* \sa SDL_CreateCond
*/
extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond *cond);
@ -410,7 +377,6 @@ extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond *cond);
* \sa SDL_CondBroadcast
* \sa SDL_CondWait
* \sa SDL_CondWaitTimeout
* \sa SDL_CondWaitTimeoutNS
* \sa SDL_CreateCond
* \sa SDL_DestroyCond
*/
@ -428,7 +394,6 @@ extern DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond *cond);
* \sa SDL_CondSignal
* \sa SDL_CondWait
* \sa SDL_CondWaitTimeout
* \sa SDL_CondWaitTimeoutNS
* \sa SDL_CreateCond
* \sa SDL_DestroyCond
*/
@ -457,7 +422,6 @@ extern DECLSPEC int SDLCALL SDL_CondBroadcast(SDL_cond *cond);
* \sa SDL_CondBroadcast
* \sa SDL_CondSignal
* \sa SDL_CondWaitTimeout
* \sa SDL_CondWaitTimeoutNS
* \sa SDL_CreateCond
* \sa SDL_DestroyCond
*/
@ -487,43 +451,12 @@ extern DECLSPEC int SDLCALL SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex);
* \sa SDL_CondBroadcast
* \sa SDL_CondSignal
* \sa SDL_CondWait
* \sa SDL_CondWaitTimeoutNS
* \sa SDL_CreateCond
* \sa SDL_DestroyCond
*/
extern DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond *cond,
SDL_mutex *mutex, Sint32 timeoutMS);
/**
* Wait until a condition variable is signaled or a certain time has passed.
*
* This function unlocks the specified `mutex` and waits for another thread to
* call SDL_CondSignal() or SDL_CondBroadcast() on the condition variable
* `cond`, or for the specified time to elapse. Once the condition variable is
* signaled or the time elapsed, the mutex is re-locked and the function
* returns.
*
* The mutex must be locked before calling this function.
*
* \param cond the condition variable to wait on
* \param mutex the mutex used to coordinate thread access
* \param timeoutNS the maximum time to wait, in nanoseconds, or `SDL_MUTEX_MAXWAIT` to wait indefinitely
* \returns 0 if the condition variable is signaled, `SDL_MUTEX_TIMEDOUT` if
* the condition is not signaled in the allotted time, or a negative
* error code on failure; call SDL_GetError() for more information.
*
* \since This function is available since SDL 3.0.0.
*
* \sa SDL_CondBroadcast
* \sa SDL_CondSignal
* \sa SDL_CondWait
* \sa SDL_CondWaitTimeout
* \sa SDL_CreateCond
* \sa SDL_DestroyCond
*/
extern DECLSPEC int SDLCALL SDL_CondWaitTimeoutNS(SDL_cond *cond,
SDL_mutex *mutex, Sint64 timeoutNS);
/* @} *//* Condition variable functions */

17
src/SDL_internal.h
View file

@ -182,6 +182,23 @@
#include <SDL3/SDL.h>
/* The internal implementations of these functions have up to nanosecond precision.
We can expose these functions as part of the API if we want to later.
*/
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif
extern DECLSPEC int SDLCALL SDL_SemWaitTimeoutNS(SDL_sem *sem, Sint64 timeoutNS);
extern DECLSPEC int SDLCALL SDL_CondWaitTimeoutNS(SDL_cond *cond, SDL_mutex *mutex, Sint64 timeoutNS);
extern DECLSPEC int SDLCALL SDL_WaitEventTimeoutNS(SDL_Event *event, Sint64 timeoutNS);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
}
#endif
#endif /* SDL_internal_h_ */
/* vi: set ts=4 sw=4 expandtab: */

3
src/dynapi/SDL_dynapi_overrides.h
View file

@ -890,8 +890,5 @@
#define SDL_GDKSuspendComplete SDL_GDKSuspendComplete_REAL
#define SDL_GetWindowWMInfo SDL_GetWindowWMInfo_REAL
#define SDL_memset4 SDL_memset4_REAL
#define SDL_WaitEventTimeoutNS SDL_WaitEventTimeoutNS_REAL
#define SDL_SemWaitTimeoutNS SDL_SemWaitTimeoutNS_REAL
#define SDL_CondWaitTimeoutNS SDL_CondWaitTimeoutNS_REAL
#define SDL_GetTicksNS SDL_GetTicksNS_REAL
#define SDL_DelayNS SDL_DelayNS_REAL

3
src/dynapi/SDL_dynapi_procs.h
View file

@ -966,8 +966,5 @@ SDL_DYNAPI_PROC(void,SDL_GDKSuspendComplete,(void),(),)
#endif
SDL_DYNAPI_PROC(int,SDL_GetWindowWMInfo,(SDL_Window *a, SDL_SysWMinfo *b, Uint32 c),(a,b,c),return)
SDL_DYNAPI_PROC(void*,SDL_memset4,(void *a, Uint32 b, size_t c),(a,b,c),return)
SDL_DYNAPI_PROC(int,SDL_WaitEventTimeoutNS,(SDL_Event *a, Sint64 b),(a,b),return)
SDL_DYNAPI_PROC(int,SDL_SemWaitTimeoutNS,(SDL_sem *a, Sint64 b),(a,b),return)
SDL_DYNAPI_PROC(int,SDL_CondWaitTimeoutNS,(SDL_cond *a, SDL_mutex *b, Sint64 c),(a,b,c),return)
SDL_DYNAPI_PROC(Uint64,SDL_GetTicksNS,(void),(),return)
SDL_DYNAPI_PROC(void,SDL_DelayNS,(Uint64 a),(a),)