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[Threading] Create new threading library and use it.

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Moved all the threading code to one place.  Added explicit support for
Darwin, Linux, Pthreads, C11 threads and Win32 threads, including new
implementations of Once for Linux, Pthreads, C11 and Win32.

rdar://90776105
This commit is contained in:
Alastair Houghton
2022-04-15 13:50:33 +01:00
parent 66b9d21000
commit f5bdb858e0
98 changed files with 2286 additions and 1410 deletions
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37
stdlib/public/runtime/Casting.cpp
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@@ -31,12 +31,7 @@
#include "swift/Runtime/ExistentialContainer.h"
#include "swift/Runtime/HeapObject.h"
#include "swift/Runtime/Metadata.h"
#if defined(__wasi__)
# define SWIFT_CASTING_SUPPORTS_MUTEX 0
#else
# define SWIFT_CASTING_SUPPORTS_MUTEX 1
# include "swift/Runtime/Mutex.h"
#endif
#include "swift/Threading/Mutex.h"
#include "swift/Basic/Unreachable.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/PointerIntPair.h"
@@ -144,10 +139,8 @@ enum class TypeNameKind {
using TypeNameCacheKey = llvm::PointerIntPair<const Metadata *, 2, TypeNameKind>;
#if SWIFT_CASTING_SUPPORTS_MUTEX
static StaticMutex TypeNameCacheLock;
static StaticMutex MangledToPrettyFunctionNameCacheLock;
#endif
static LazyMutex TypeNameCacheLock;
static LazyMutex MangledToPrettyFunctionNameCacheLock;
/// Cache containing rendered names for Metadata.
/// Access MUST be protected using `TypeNameCacheLock`.
@@ -166,9 +159,7 @@ swift::swift_getTypeName(const Metadata *type, bool qualified) {
// Attempt read-only lookup of cache entry.
{
#if SWIFT_CASTING_SUPPORTS_MUTEX
StaticMutex::ScopedLock guard(TypeNameCacheLock);
#endif
LazyMutex::ScopedLock guard(TypeNameCacheLock);
auto found = cache.find(key);
if (found != cache.end()) {
@@ -179,9 +170,7 @@ swift::swift_getTypeName(const Metadata *type, bool qualified) {
// Read-only lookup failed to find item, we may need to create it.
{
#if SWIFT_CASTING_SUPPORTS_MUTEX
StaticMutex::ScopedLock guard(TypeNameCacheLock);
#endif
LazyMutex::ScopedLock guard(TypeNameCacheLock);
// Do lookup again just to make sure it wasn't created by another
// thread before we acquired the write lock.
@@ -212,9 +201,7 @@ swift::swift_getMangledTypeName(const Metadata *type) {
// Attempt read-only lookup of cache entry.
{
#if SWIFT_CASTING_SUPPORTS_MUTEX
StaticMutex::ScopedLock guard(TypeNameCacheLock);
#endif
LazyMutex::ScopedLock guard(TypeNameCacheLock);
auto found = cache.find(key);
if (found != cache.end()) {
@@ -225,9 +212,7 @@ swift::swift_getMangledTypeName(const Metadata *type) {
// Read-only cache lookup failed, we may need to create it.
{
#if SWIFT_CASTING_SUPPORTS_MUTEX
StaticMutex::ScopedLock guard(TypeNameCacheLock);
#endif
LazyMutex::ScopedLock guard(TypeNameCacheLock);
// Do lookup again just to make sure it wasn't created by another
// thread before we acquired the write lock.
@@ -270,9 +255,7 @@ swift::swift_getFunctionFullNameFromMangledName(
auto &cache = MangledToPrettyFunctionNameCache.get();
// Attempt read-only lookup of cache entry.
{
#if SWIFT_CASTING_SUPPORTS_MUTEX
StaticMutex::ScopedLock guard(MangledToPrettyFunctionNameCacheLock);
#endif
LazyMutex::ScopedLock guard(MangledToPrettyFunctionNameCacheLock);
auto found = cache.find(mangledName);
if (found != cache.end()) {
@@ -387,9 +370,7 @@ swift::swift_getFunctionFullNameFromMangledName(
result[size] = 0; // 0-terminated string
{
#if SWIFT_CASTING_SUPPORTS_MUTEX
StaticMutex::ScopedLock guard(MangledToPrettyFunctionNameCacheLock);
#endif
LazyMutex::ScopedLock guard(MangledToPrettyFunctionNameCacheLock);
cache.insert({mangledName, {result, size}});
return TypeNamePair{result, size};