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Merge "linker_memory: return success in enable_fallback_allocator."

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am: 6fa9bddbc7

Change-Id: If5636675dfd39e1a5d42f875917c2462efb97749
This commit is contained in:
Josh Gao 2018-02-10 01:59:21 +00:00 committed by android-build-merger
commit 57bbcbd847
1 changed files with 11 additions and 10 deletions
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21
linker/linker_memory.cpp
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@ -32,27 +32,28 @@
#include <sys/cdefs.h>
#include <unistd.h>
#include <atomic>
#include <async_safe/log.h>
static LinkerMemoryAllocator g_linker_allocator;
static pid_t fallback_tid = 0;
static std::atomic<pid_t> fallback_tid(0);
// Used by libdebuggerd_handler to switch allocators during a crash dump, in
// case the linker heap is corrupted. Do not use this function.
extern "C" void __linker_enable_fallback_allocator() {
if (fallback_tid != 0) {
async_safe_fatal("attempted to use currently-in-use fallback allocator");
}
fallback_tid = gettid();
extern "C" bool __linker_enable_fallback_allocator() {
pid_t expected = 0;
return fallback_tid.compare_exchange_strong(expected, gettid());
}
extern "C" void __linker_disable_fallback_allocator() {
if (fallback_tid == 0) {
pid_t previous = fallback_tid.exchange(0);
if (previous == 0) {
async_safe_fatal("attempted to disable unused fallback allocator");
} else if (previous != gettid()) {
async_safe_fatal("attempted to disable fallback allocator in use by another thread (%d)",
previous);
}
fallback_tid = 0;
}
static LinkerMemoryAllocator& get_fallback_allocator() {