/usr/include/nspr/plarenas.h is in libnspr4-dev 4.8.9-1ubuntu2.
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#ifndef PLARENAS_H
#define PLARENAS_H
PR_BEGIN_EXTERN_C
typedef struct PLArenaPool PLArenaPool;
/*
** Initialize an arena pool with the given name for debugging and metering,
** with a minimum size per arena of size bytes.
**/
PR_EXTERN(void) PL_InitArenaPool(
PLArenaPool *pool, const char *name, PRUint32 size, PRUint32 align);
/*
** Finish using arenas, freeing all memory associated with them.
**/
PR_EXTERN(void) PL_ArenaFinish(void);
/*
** Free the arenas in pool. The user may continue to allocate from pool
** after calling this function. There is no need to call PL_InitArenaPool()
** again unless PL_FinishArenaPool(pool) has been called.
**/
PR_EXTERN(void) PL_FreeArenaPool(PLArenaPool *pool);
/*
** Free the arenas in pool and finish using it altogether.
**/
PR_EXTERN(void) PL_FinishArenaPool(PLArenaPool *pool);
/*
** Compact all of the arenas in a pool so that no space is wasted.
** NOT IMPLEMENTED. Do not use.
**/
PR_EXTERN(void) PL_CompactArenaPool(PLArenaPool *pool);
/*
** Friend functions used by the PL_ARENA_*() macros.
**/
PR_EXTERN(void *) PL_ArenaAllocate(PLArenaPool *pool, PRUint32 nb);
PR_EXTERN(void *) PL_ArenaGrow(
PLArenaPool *pool, void *p, PRUint32 size, PRUint32 incr);
PR_EXTERN(void) PL_ArenaRelease(PLArenaPool *pool, char *mark);
/*
** memset contents of all arenas in pool to pattern
*/
PR_EXTERN(void) PL_ClearArenaPool(PLArenaPool *pool, PRInt32 pattern);
PR_END_EXTERN_C
#endif /* PLARENAS_H */
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