diff options
Diffstat (limited to 'extra/jemalloc/src/chunk_dss.c')
| -rw-r--r-- | extra/jemalloc/src/chunk_dss.c | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/extra/jemalloc/src/chunk_dss.c b/extra/jemalloc/src/chunk_dss.c deleted file mode 100644 index 24781cc52dc..00000000000 --- a/extra/jemalloc/src/chunk_dss.c +++ /dev/null @@ -1,197 +0,0 @@ -#define JEMALLOC_CHUNK_DSS_C_ -#include "jemalloc/internal/jemalloc_internal.h" -/******************************************************************************/ -/* Data. */ - -const char *dss_prec_names[] = { - "disabled", - "primary", - "secondary", - "N/A" -}; - -/* Current dss precedence default, used when creating new arenas. */ -static dss_prec_t dss_prec_default = DSS_PREC_DEFAULT; - -/* - * Protects sbrk() calls. This avoids malloc races among threads, though it - * does not protect against races with threads that call sbrk() directly. - */ -static malloc_mutex_t dss_mtx; - -/* Base address of the DSS. */ -static void *dss_base; -/* Current end of the DSS, or ((void *)-1) if the DSS is exhausted. */ -static void *dss_prev; -/* Current upper limit on DSS addresses. */ -static void *dss_max; - -/******************************************************************************/ - -#ifndef JEMALLOC_HAVE_SBRK -static void * -sbrk(intptr_t increment) -{ - - not_implemented(); - - return (NULL); -} -#endif - -dss_prec_t -chunk_dss_prec_get(void) -{ - dss_prec_t ret; - - if (config_dss == false) - return (dss_prec_disabled); - malloc_mutex_lock(&dss_mtx); - ret = dss_prec_default; - malloc_mutex_unlock(&dss_mtx); - return (ret); -} - -bool -chunk_dss_prec_set(dss_prec_t dss_prec) -{ - - if (config_dss == false) - return (true); - malloc_mutex_lock(&dss_mtx); - dss_prec_default = dss_prec; - malloc_mutex_unlock(&dss_mtx); - return (false); -} - -void * -chunk_alloc_dss(size_t size, size_t alignment, bool *zero) -{ - void *ret; - - cassert(config_dss); - assert(size > 0 && (size & chunksize_mask) == 0); - assert(alignment > 0 && (alignment & chunksize_mask) == 0); - - /* - * sbrk() uses a signed increment argument, so take care not to - * interpret a huge allocation request as a negative increment. - */ - if ((intptr_t)size < 0) - return (NULL); - - malloc_mutex_lock(&dss_mtx); - if (dss_prev != (void *)-1) { - size_t gap_size, cpad_size; - void *cpad, *dss_next; - intptr_t incr; - - /* - * The loop is necessary to recover from races with other - * threads that are using the DSS for something other than - * malloc. - */ - do { - /* Get the current end of the DSS. */ - dss_max = sbrk(0); - /* - * Calculate how much padding is necessary to - * chunk-align the end of the DSS. - */ - gap_size = (chunksize - CHUNK_ADDR2OFFSET(dss_max)) & - chunksize_mask; - /* - * Compute how much chunk-aligned pad space (if any) is - * necessary to satisfy alignment. This space can be - * recycled for later use. - */ - cpad = (void *)((uintptr_t)dss_max + gap_size); - ret = (void *)ALIGNMENT_CEILING((uintptr_t)dss_max, - alignment); - cpad_size = (uintptr_t)ret - (uintptr_t)cpad; - dss_next = (void *)((uintptr_t)ret + size); - if ((uintptr_t)ret < (uintptr_t)dss_max || - (uintptr_t)dss_next < (uintptr_t)dss_max) { - /* Wrap-around. */ - malloc_mutex_unlock(&dss_mtx); - return (NULL); - } - incr = gap_size + cpad_size + size; - dss_prev = sbrk(incr); - if (dss_prev == dss_max) { - /* Success. */ - dss_max = dss_next; - malloc_mutex_unlock(&dss_mtx); - if (cpad_size != 0) - chunk_unmap(cpad, cpad_size); - if (*zero) { - VALGRIND_MAKE_MEM_UNDEFINED(ret, size); - memset(ret, 0, size); - } - return (ret); - } - } while (dss_prev != (void *)-1); - } - malloc_mutex_unlock(&dss_mtx); - - return (NULL); -} - -bool -chunk_in_dss(void *chunk) -{ - bool ret; - - cassert(config_dss); - - malloc_mutex_lock(&dss_mtx); - if ((uintptr_t)chunk >= (uintptr_t)dss_base - && (uintptr_t)chunk < (uintptr_t)dss_max) - ret = true; - else - ret = false; - malloc_mutex_unlock(&dss_mtx); - - return (ret); -} - -bool -chunk_dss_boot(void) -{ - - cassert(config_dss); - - if (malloc_mutex_init(&dss_mtx)) - return (true); - dss_base = sbrk(0); - dss_prev = dss_base; - dss_max = dss_base; - - return (false); -} - -void -chunk_dss_prefork(void) -{ - - if (config_dss) - malloc_mutex_prefork(&dss_mtx); -} - -void -chunk_dss_postfork_parent(void) -{ - - if (config_dss) - malloc_mutex_postfork_parent(&dss_mtx); -} - -void -chunk_dss_postfork_child(void) -{ - - if (config_dss) - malloc_mutex_postfork_child(&dss_mtx); -} - -/******************************************************************************/ |