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Issue 2535213002: [WIP] Add SharedMemoryTracker to dump base::SharedMemory usage
Patch Set: (rebase) Created 3 years, 6 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "base/memory/shared_memory.h" 5 #include "base/memory/shared_memory.h"
6 6
7 #include <errno.h> 7 #include <errno.h>
8 #include <fcntl.h> 8 #include <fcntl.h>
9 #include <stddef.h> 9 #include <stddef.h>
10 #include <sys/mman.h> 10 #include <sys/mman.h>
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352 *path = temp_dir.AppendASCII(name_base + ".shmem." + mem_name); 352 *path = temp_dir.AppendASCII(name_base + ".shmem." + mem_name);
353 return true; 353 return true;
354 } 354 }
355 #endif // !defined(OS_ANDROID) 355 #endif // !defined(OS_ANDROID)
356 356
357 SharedMemoryHandle SharedMemory::GetReadOnlyHandle() { 357 SharedMemoryHandle SharedMemory::GetReadOnlyHandle() {
358 CHECK(readonly_shm_.IsValid()); 358 CHECK(readonly_shm_.IsValid());
359 return readonly_shm_.Duplicate(); 359 return readonly_shm_.Duplicate();
360 } 360 }
361 361
362 bool SharedMemory::GetUniqueId(SharedMemory::UniqueId* id) const {
363 // This function is called just after mmap. fstat is a system call that might
364 // cause I/O. It's safe to call fstat here because mmap for shared memory is
365 // called in two cases:
366 // 1) To handle file-mapped memory
367 // 2) To handle annonymous shared memory
368 // In 1), I/O is already permitted. In 2), the backend is on page cache and
369 // fstat doesn't cause I/O access to the disk. See the discussion at
370 // crbug.com/604726#c41.
371 base::ThreadRestrictions::ScopedAllowIO allow_io;
372 struct stat file_stat;
373 if (HANDLE_EINTR(
374 ::fstat(static_cast<int>(handle().GetHandle()), &file_stat)) != 0)
375 return false;
376 id->first = file_stat.st_dev;
377 id->second = file_stat.st_ino;
378 return true;
379 }
380
381 } // namespace base 362 } // namespace base
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