diff options
Diffstat (limited to 'src/google/malloc_extension.h')
| -rw-r--r-- | src/google/malloc_extension.h | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/src/google/malloc_extension.h b/src/google/malloc_extension.h index e088154..5244aa1 100644 --- a/src/google/malloc_extension.h +++ b/src/google/malloc_extension.h @@ -30,13 +30,13 @@ // --- // Author: Sanjay Ghemawat <opensource@google.com> // -// Extra interfaces exported by some malloc implementations. These -// interfaces are accessed through a virtual base class so an +// Extra extensions exported by some malloc implementations. These +// extensions are accessed through a virtual base class so an // application can link against a malloc that does not implement these -// interfaces, and it will get default versions that do nothing. +// extensions, and it will get default versions that do nothing. -#ifndef _GOOGLE_MALLOC_EXTENSION_H__ -#define _GOOGLE_MALLOC_EXTENSION_H__ +#ifndef BASE_MALLOC_EXTENSION_H__ +#define BASE_MALLOC_EXTENSION_H__ #include <stddef.h> #include <string> @@ -137,6 +137,26 @@ class MallocExtension { // REQUIRES: property != NULL virtual bool SetNumericProperty(const char* property, size_t value); + // Mark the current thread as "idle". This routine may optionally + // be called by threads as a hint to the malloc implementation that + // any thread-specific resources should be released. Note: this may + // be an expensive routine, so it should not be called too often. + // + // Also, if the code that calls this routine will go to sleep for + // a while, it should take care to not allocate anything between + // the call to this routine and the beginning of the sleep. + // + // Most malloc implementations ignore this routine. + virtual void MarkThreadIdle(); + + // Try to free memory back to the operating system for reuse. Only + // use this extension if the application has recently freed a lot of + // memory, and does not anticipate using it again for a long time -- + // to get this memory back may require faulting pages back in by the + // OS, and that may be slow. (Currently only implemented in + // tcmalloc.) + virtual void ReleaseFreeMemory(); + // The current malloc implementation. Always non-NULL. static MallocExtension* instance(); @@ -170,4 +190,4 @@ class MallocExtension { virtual void** ReadHeapGrowthStackTraces(); }; -#endif // _GOOGLE_MALLOC_EXTENSION_H__ +#endif // BASE_MALLOC_EXTENSION_H__ |