Migrate the C use of SbAtomic to c11 (youtube#4145)

b/310724224

chrome/updater/configurator.h

@@ -20,6 +20,10 @@
 #include "components/update_client/configurator.h"
 #include "components/update_client/persisted_data.h"
 
+#if defined(STARBOARD)
+#include "starboard/atomic.h"
+#endif
+
 class GURL;
 class PrefService;
 

starboard/atomic.h

@@ -26,6 +26,10 @@
 #include "starboard/configuration.h"
 #include "starboard/types.h"
 
+#ifndef __cplusplus
+#error "This header should not be included in C source code"
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif

starboard/nplb/include_all.c

@@ -14,7 +14,6 @@
 
 // Includes all headers in a C context to make sure they compile as C files.
 
-#include "starboard/atomic.h"
 #include "starboard/audio_sink.h"
 #include "starboard/configuration.h"
 #include "starboard/cpu_features.h"

third_party/boringssl/BUILD.gn

@@ -242,8 +242,7 @@ if (!use_cobalt_customizations) {
     sources += [
       "src/crypto/cpu-starboard.c",
       "src/crypto/rand_extra/starboard.c",
-      "src/crypto/refcount_starboard.c",
-      "src/crypto/thread_starboard.cc",
+      "src/crypto/thread_starboard.c",
     ]
     public -= [ "src/include/openssl/opensslconf.h" ]
     public_deps = [

third_party/boringssl/src/crypto/internal.h

@@ -121,7 +121,6 @@
 #ifdef STARBOARD
 #include <pthread.h>
 
-#include "starboard/atomic.h"
 #include "starboard/thread.h"
 #endif
 
@@ -563,18 +562,13 @@ OPENSSL_EXPORT void CRYPTO_once(CRYPTO_once_t *once, void (*init)(void));
 
 // Automatically enable C11 atomics if implemented.
 #if !defined(OPENSSL_C11_ATOMIC) && defined(OPENSSL_THREADS) &&   \
-    !defined(STARBOARD) && \
     !defined(__STDC_NO_ATOMICS__) && defined(__STDC_VERSION__) && \
     __STDC_VERSION__ >= 201112L
 #define OPENSSL_C11_ATOMIC
 #endif
 
 // CRYPTO_REFCOUNT_MAX is the value at which the reference count saturates.
-#if defined(STARBOARD)
-#define CRYPTO_REFCOUNT_MAX 0x7fffffff
-#else
 #define CRYPTO_REFCOUNT_MAX 0xffffffff
-#endif
 
 // CRYPTO_refcount_inc atomically increments the value at |*count| unless the
 // value would overflow. It's safe for multiple threads to concurrently call
@@ -606,7 +600,7 @@ OPENSSL_EXPORT int CRYPTO_refcount_dec_and_test_zero(CRYPTO_refcount_t *count);
 
 #if defined(STARBOARD)
 struct CRYPTO_STATIC_MUTEX {
-  SbAtomic32 initialized;
+  uint32_t initialized;
   CRYPTO_MUTEX mutex;
 };
 #define CRYPTO_STATIC_MUTEX_INIT { 0 }

third_party/boringssl/src/crypto/thread_starboard.cc → third_party/boringssl/src/crypto/thread_starboard.c

@@ -18,71 +18,72 @@
 
 #if defined(STARBOARD)
 #include <pthread.h>
+#include <stdatomic.h>
 #include <unistd.h>
 
 #include <openssl/mem.h>
 
 #include "starboard/thread.h"
 
-namespace {
 
 // Each enum of thread_local_data_t corresponds to a ThreadLocalEntry.
-struct ThreadLocalEntry {
+typedef struct ThreadLocalEntry {
   thread_local_destructor_t destructor;
   void* value;
-};
+} ThreadLocalEntry;
 
 // One thread local key will point to an array of ThreadLocalEntry.
 static pthread_key_t g_thread_local_key = 0;
 static int g_thread_local_key_created = 0;
 
 // Control the creation of the global thread local key.
-pthread_once_t g_thread_local_once_control = PTHREAD_ONCE_INIT;
+static pthread_once_t g_thread_local_once_control = PTHREAD_ONCE_INIT;
 
-void ThreadLocalDestructor(void* value) {
+static void ThreadLocalDestructor(void* value) {
   if (value) {
-    ThreadLocalEntry* thread_locals = static_cast<ThreadLocalEntry*>(value);
+    ThreadLocalEntry* thread_locals = (ThreadLocalEntry*)(value);
     for (int i = 0; i < NUM_OPENSSL_THREAD_LOCALS; ++i) {
-      if (thread_locals[i].destructor != nullptr) {
+      if (thread_locals[i].destructor != NULL) {
         thread_locals[i].destructor(thread_locals[i].value);
       }
     }
     OPENSSL_free(value);
   }
 }
 
-void ThreadLocalInit() {
+static void ThreadLocalInit() {
   g_thread_local_key_created = pthread_key_create(&g_thread_local_key, &ThreadLocalDestructor) == 0;
 }
 
-void EnsureInitialized(struct CRYPTO_STATIC_MUTEX* lock) {
+static void EnsureInitialized(struct CRYPTO_STATIC_MUTEX* lock) {
   enum {
     kUninitialized = 0,
     kInitializing,
     kInitialized
   };
 
-  if (SbAtomicNoBarrier_Load(&lock->initialized) == kInitialized) {
+  if (atomic_load((_Atomic uint32_t *)&lock->initialized) == kInitialized) {
     return;
   }
-  if (SbAtomicNoBarrier_CompareAndSwap(&lock->initialized,
-      kUninitialized, kInitializing) == kUninitialized) {
+
+  uint32_t expected = kUninitialized;
+
+  if (atomic_compare_exchange_weak((_Atomic uint32_t *)&lock->initialized,
+                                   &expected, kInitializing)) {
     CRYPTO_MUTEX_init(&lock->mutex);
-    SbAtomicNoBarrier_Store(&lock->initialized, kInitialized);
+    atomic_store((_Atomic uint32_t *)&lock->initialized, kInitialized);
     return;
   }
-  while (SbAtomicNoBarrier_Load(&lock->initialized) != kInitialized) {
+  while (atomic_load((_Atomic uint32_t *)&lock->initialized) != kInitialized) {
     usleep(1000);  // 1ms
   }
 }
 
-}  // namespace
-
 void CRYPTO_MUTEX_init(CRYPTO_MUTEX* lock) {
-  if (pthread_mutex_init(&lock->mutex, nullptr) != 0) {
+  if (pthread_mutex_init(&lock->mutex, NULL) != 0) {
     SbSystemBreakIntoDebugger();
   }
-  if (pthread_cond_init(&lock->condition, nullptr) != 0) {
+  if (pthread_cond_init(&lock->condition, NULL) != 0) {
     SbSystemBreakIntoDebugger();
   }
   lock->readers = 0;
@@ -183,13 +184,13 @@ void CRYPTO_STATIC_MUTEX_unlock_write(struct CRYPTO_STATIC_MUTEX* lock) {
 void* CRYPTO_get_thread_local(thread_local_data_t index) {
   pthread_once(&g_thread_local_once_control, &ThreadLocalInit);
   if (!g_thread_local_key_created) {
-    return nullptr;
+    return NULL;
   }
 
-  ThreadLocalEntry* thread_locals = static_cast<ThreadLocalEntry*>(
+  ThreadLocalEntry* thread_locals = (ThreadLocalEntry*)(
       pthread_getspecific(g_thread_local_key));
-  if (thread_locals == nullptr) {
-    return nullptr;
+  if (thread_locals == NULL) {
+    return NULL;
   }
 
   return thread_locals[index].value;
@@ -203,14 +204,14 @@ int CRYPTO_set_thread_local(thread_local_data_t index, void *value,
     return 0;
   }
 
-  ThreadLocalEntry* thread_locals = static_cast<ThreadLocalEntry*>(
+  ThreadLocalEntry* thread_locals = (ThreadLocalEntry*)(
       pthread_getspecific(g_thread_local_key));
-  if (thread_locals == nullptr) {
+  if (thread_locals == NULL) {
     size_t thread_locals_size =
         sizeof(ThreadLocalEntry) * NUM_OPENSSL_THREAD_LOCALS;
-    thread_locals = static_cast<ThreadLocalEntry*>(
+    thread_locals = (ThreadLocalEntry*)(
         OPENSSL_malloc(thread_locals_size));
-    if (thread_locals == nullptr) {
+    if (thread_locals == NULL) {
       destructor(value);
       return 0;
     }

third_party/boringssl/src/include/openssl/thread.h

@@ -61,10 +61,6 @@
 
 #include <openssl/base.h>
 
-#ifdef STARBOARD
-#include "starboard/atomic.h"
-#endif
-
 #if defined(__cplusplus)
 extern "C" {
 #endif
@@ -114,11 +110,7 @@ typedef union crypto_mutex_st {
 // as C code that might not set -std=c11. So, in practice, it's not possible to
 // do that. Instead we statically assert that the size and native alignment of
 // a plain uint32_t and an _Atomic uint32_t are equal in refcount_c11.c.
-#if defined(STARBOARD)
-typedef SbAtomic32 CRYPTO_refcount_t;
-#else
 typedef uint32_t CRYPTO_refcount_t;
-#endif
 
 
 // Deprecated functions.