diff options
Diffstat (limited to 'src/pkg/runtime/malloc.h')
| -rw-r--r-- | src/pkg/runtime/malloc.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/src/pkg/runtime/malloc.h b/src/pkg/runtime/malloc.h index eb11cced68..ca6289174e 100644 --- a/src/pkg/runtime/malloc.h +++ b/src/pkg/runtime/malloc.h @@ -175,12 +175,18 @@ struct MLink // SysReserve reserves address space without allocating memory. // If the pointer passed to it is non-nil, the caller wants the // reservation there, but SysReserve can still choose another -// location if that one is unavailable. +// location if that one is unavailable. On some systems and in some +// cases SysReserve will simply check that the address space is +// available and not actually reserve it. If SysReserve returns +// non-nil, it sets *reserved to true if the address space is +// reserved, false if it has merely been checked. // NOTE: SysReserve returns OS-aligned memory, but the heap allocator // may use larger alignment, so the caller must be careful to realign the // memory obtained by SysAlloc. // // SysMap maps previously reserved address space for use. +// The reserved argument is true if the address space was really +// reserved, not merely checked. // // SysFault marks a (already SysAlloc'd) region to fault // if accessed. Used only for debugging the runtime. @@ -189,8 +195,8 @@ void* runtime·SysAlloc(uintptr nbytes, uint64 *stat); void runtime·SysFree(void *v, uintptr nbytes, uint64 *stat); void runtime·SysUnused(void *v, uintptr nbytes); void runtime·SysUsed(void *v, uintptr nbytes); -void runtime·SysMap(void *v, uintptr nbytes, uint64 *stat); -void* runtime·SysReserve(void *v, uintptr nbytes); +void runtime·SysMap(void *v, uintptr nbytes, bool reserved, uint64 *stat); +void* runtime·SysReserve(void *v, uintptr nbytes, bool *reserved); void runtime·SysFault(void *v, uintptr nbytes); // FixAlloc is a simple free-list allocator for fixed size objects. @@ -492,6 +498,7 @@ struct MHeap byte *arena_start; byte *arena_used; byte *arena_end; + bool arena_reserved; // central free lists for small size classes. // the padding makes sure that the MCentrals are |