Mirrors/bx
1
0
Fork 0
mirror of https://github.com/bkaradzic/bx.git synced 2026-02-18 04:53:06 +01:00
Code Issues Packages Projects Releases Wiki Activity

crtnone: Added mutex.

Browse Source
This commit is contained in:
Branimir Karadžić
2018-03-14 22:30:37 -07:00
parent 5331c9177e
commit 21191b04f8
1 changed files with 33 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
src/mutex.cpp
View File

@@ -9,6 +9,8 @@
#if BX_CONFIG_SUPPORTS_THREADING
#if BX_CRT_NONE
# include <bx/cpu.h>
# include "crt0.h"
#elif BX_PLATFORM_ANDROID \
|| BX_PLATFORM_LINUX \
|| BX_PLATFORM_IOS \
@@ -26,9 +28,22 @@
namespace bx
{
#if BX_CRT_NONE
struct State
{
enum Enum
{
Unlocked,
Locked,
Contested,
};
};
Mutex::Mutex()
{
BX_STATIC_ASSERT(sizeof(pthread_mutex_t) <= sizeof(m_internal) );
BX_STATIC_ASSERT(sizeof(int32_t) <= sizeof(m_internal) );
uint32_t* futex = (uint32_t*)m_internal;
*futex = State::Unlocked;
}
Mutex::~Mutex()
@@ -37,10 +52,27 @@ namespace bx
void Mutex::lock()
{
uint32_t* futex = (uint32_t*)m_internal;
if (State::Unlocked == bx::atomicCompareAndSwap<uint32_t>(futex, State::Unlocked, State::Locked) )
{
return;
}
while (State::Unlocked != bx::atomicCompareAndSwap<uint32_t>(futex, State::Locked, State::Contested) )
{
crt0::futexWait(futex, State::Contested);
}
}
void Mutex::unlock()
{
uint32_t* futex = (uint32_t*)m_internal;
if (State::Contested == bx::atomicCompareAndSwap<uint32_t>(futex, State::Locked, State::Unlocked) )
{
crt0::futexWake(futex, State::Locked);
}
}
#else