[libunwind] Add support for a single-threaded libunwind build
The EHABI unwinder is thread-agnostic, SJLJ unwinder and the DWARF unwinder have
a couple of pthread dependencies.
This patch makes it possible to build the whole of libunwind for a
single-threaded environment.
Reviewers: compnerd
Differential revision: https://reviews.llvm.org/D24984
llvm-svn: 282575
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 6264758cc8cd62205b9073828359fb866bc27d59
diff --git a/src/UnwindCursor.hpp b/src/UnwindCursor.hpp
index 2ceaf08..4ed5a6e 100644
--- a/src/UnwindCursor.hpp
+++ b/src/UnwindCursor.hpp
@@ -16,7 +16,9 @@
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
-#include <pthread.h>
+#ifndef _LIBUNWIND_HAS_NO_THREADS
+ #include <pthread.h>
+#endif
#include <unwind.h>
#ifdef __APPLE__
@@ -60,7 +62,9 @@
// These fields are all static to avoid needing an initializer.
// There is only one instance of this class per process.
+#ifndef _LIBUNWIND_HAS_NO_THREADS
static pthread_rwlock_t _lock;
+#endif
#ifdef __APPLE__
static void dyldUnloadHook(const struct mach_header *mh, intptr_t slide);
static bool _registeredForDyldUnloads;
@@ -87,8 +91,10 @@
template <typename A>
typename DwarfFDECache<A>::entry DwarfFDECache<A>::_initialBuffer[64];
+#ifndef _LIBUNWIND_HAS_NO_THREADS
template <typename A>
pthread_rwlock_t DwarfFDECache<A>::_lock = PTHREAD_RWLOCK_INITIALIZER;
+#endif
#ifdef __APPLE__
template <typename A>