SDL 2.0
SDL_error_c.h File Reference
#include "./SDL_internal.h"
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Data Structures

struct  SDL_error
 

Macros

#define ERR_MAX_STRLEN   128
 
#define ERR_MAX_ARGS   5
 

Functions

SDL_errorSDL_GetErrBuf (void)
 

Macro Definition Documentation

◆ ERR_MAX_ARGS

#define ERR_MAX_ARGS   5

Definition at line 31 of file SDL_error_c.h.

◆ ERR_MAX_STRLEN

#define ERR_MAX_STRLEN   128

Definition at line 30 of file SDL_error_c.h.

Function Documentation

◆ SDL_GetErrBuf()

SDL_error * SDL_GetErrBuf ( void  )

Definition at line 206 of file SDL_thread.c.

207{
208 static SDL_SpinLock tls_lock;
209 static SDL_bool tls_being_created;
210 static SDL_TLSID tls_errbuf;
211 static SDL_error SDL_global_errbuf;
212 const SDL_error *ALLOCATION_IN_PROGRESS = (SDL_error *)-1;
213 SDL_error *errbuf;
214
215 /* tls_being_created is there simply to prevent recursion if SDL_TLSCreate() fails.
216 It also means it's possible for another thread to also use SDL_global_errbuf,
217 but that's very unlikely and hopefully won't cause issues.
218 */
219 if (!tls_errbuf && !tls_being_created) {
220 SDL_AtomicLock(&tls_lock);
221 if (!tls_errbuf) {
222 SDL_TLSID slot;
223 tls_being_created = SDL_TRUE;
224 slot = SDL_TLSCreate();
225 tls_being_created = SDL_FALSE;
227 tls_errbuf = slot;
228 }
229 SDL_AtomicUnlock(&tls_lock);
230 }
231 if (!tls_errbuf) {
232 return &SDL_global_errbuf;
233 }
234
236 errbuf = (SDL_error *)SDL_TLSGet(tls_errbuf);
237 if (errbuf == ALLOCATION_IN_PROGRESS) {
238 return &SDL_global_errbuf;
239 }
240 if (!errbuf) {
241 /* Mark that we're in the middle of allocating our buffer */
242 SDL_TLSSet(tls_errbuf, ALLOCATION_IN_PROGRESS, NULL);
243 errbuf = (SDL_error *)SDL_malloc(sizeof(*errbuf));
244 if (!errbuf) {
245 SDL_TLSSet(tls_errbuf, NULL, NULL);
246 return &SDL_global_errbuf;
247 }
248 SDL_zerop(errbuf);
249 SDL_TLSSet(tls_errbuf, errbuf, SDL_free);
250 }
251 return errbuf;
252}
#define SDL_MemoryBarrierRelease()
Definition: SDL_atomic.h:207
int SDL_SpinLock
Definition: SDL_atomic.h:89
#define SDL_MemoryBarrierAcquire()
Definition: SDL_atomic.h:208
#define SDL_AtomicLock
#define SDL_malloc
#define SDL_AtomicUnlock
#define SDL_free
SDL_bool
Definition: SDL_stdinc.h:162
@ SDL_TRUE
Definition: SDL_stdinc.h:164
@ SDL_FALSE
Definition: SDL_stdinc.h:163
#define SDL_zerop(x)
Definition: SDL_stdinc.h:417
void * SDL_TLSGet(SDL_TLSID id)
Get the value associated with a thread local storage ID for the current thread.
Definition: SDL_thread.c:41
SDL_TLSID SDL_TLSCreate()
Create an identifier that is globally visible to all threads but refers to data that is thread-specif...
Definition: SDL_thread.c:34
int SDL_TLSSet(SDL_TLSID id, const void *value, void(*destructor)(void *))
Set the value associated with a thread local storage ID for the current thread.
Definition: SDL_thread.c:53
unsigned int SDL_TLSID
Definition: SDL_thread.h:52
#define NULL
Definition: begin_code.h:167