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libbinder: add a NO_CACHING flag to MemoryHeapBase

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The NO_CACHING flag translates to opening a memory region with O_SYNC.

Signed-off-by: Iliyan Malchev <malchev@google.com>
This commit is contained in:
Iliyan Malchev 2009-10-29 22:55:00 -07:00
parent db95a9e824
commit 0db1a8931b
2 changed files with 7 additions and 2 deletions
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3
include/binder/MemoryHeapBase.h
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@ -35,7 +35,8 @@ public:
MAP_ONCE = IMemoryHeap::MAP_ONCE,
// memory won't be mapped locally, but will be mapped in the remote
// process.
DONT_MAP_LOCALLY = 0x00000100
DONT_MAP_LOCALLY = 0x00000100,
NO_CACHING = 0x00000200
};
/*

6
libs/binder/MemoryHeapBase.cpp
View File

@ -67,7 +67,11 @@ MemoryHeapBase::MemoryHeapBase(const char* device, size_t size, uint32_t flags)
: mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
mDevice(0), mNeedUnmap(false)
{
int fd = open(device, O_RDWR);
int open_flags = O_RDWR;
if (flags & NO_CACHING)
open_flags |= O_SYNC;
int fd = open(device, open_flags);
LOGE_IF(fd<0, "error opening %s: %s", device, strerror(errno));
if (fd >= 0) {
const size_t pagesize = getpagesize();