EDK2中如何实现多线程
时间: 2024-03-15 17:45:07 浏览: 12
在EDK2中,可以使用UEFI的多线程API实现多线程。下面是一个简单的示例代码:
```c
#include <Uefi.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Protocol/LoadedImage.h>
#include <Protocol/SimpleFileSystem.h>
#include <Protocol/EFIApplication.h>
#include <Protocol/EFIStdErr.h>
#include <Protocol/EFIStatus.h>
#include <Protocol/EFIErrorHandling.h>
#include <Protocol/EFIProcess.h>
#include <Protocol/EFIProcessEnv.h>
EFI_STATUS EFIAPI UefiMain(IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable)
{
// 创建线程
EFI_STATUS Status;
EFI_PROCESS_PROTOCOL *ProcessProtocol;
Status = gBS->LocateProtocol(&gEfiProcessProtocolGuid, NULL, (VOID **)&ProcessProtocol);
if (EFI_ERROR(Status))
{
Print(L"Locate Protocol Failed\n");
return Status;
}
EFI_PROCESS_ID ProcessId;
Status = ProcessProtocol->CreateProcess(ProcessProtocol, L"ThreadProcess", 0, 0, 0, 0, 0, &ProcessId);
if (EFI_ERROR(Status))
{
Print(L"Create Process Failed\n");
return Status;
}
// 获取当前线程ID
EFI_PROCESS_ID CurrentThreadId;
Status = ProcessProtocol->GetCurrentThread(ProcessProtocol, &CurrentThreadId);
if (EFI_ERROR(Status))
{
Print(L"Get Current Thread Failed\n");
return Status;
}
// 创建线程环境
EFI_PROCESS_ENVIRONMENT *ThreadEnv;
Status = ProcessProtocol->CreateThread(ProcessProtocol, ProcessId, L"ThreadEnv", &ThreadEnv);
if (EFI_ERROR(Status))
{
Print(L"Create Thread Env Failed\n");
return Status;
}
// 启动线程
EFI_EVENT ThreadEvent;
Status = ProcessProtocol->CreateEvent(ProcessProtocol, EFI_EVENT_NOTIFY_SIGNAL, 0, NULL, &ThreadEvent);
if (EFI_ERROR(Status))
{
Print(L"Create Thread Event Failed\n");
return Status;
}
Status = ProcessProtocol->StartThread(ProcessProtocol, ThreadEnv, 0, NULL, &ThreadEvent);
if (EFI_ERROR(Status))
{
Print(L"Start Thread Failed\n");
return Status;
}
// 等待线程结束
gBS->WaitForEvent(1, &ThreadEvent, NULL);
gBS->CloseEvent(ThreadEvent);
// 清理资源
ProcessProtocol->Terminate(ProcessProtocol, ProcessId, EFI_SUCCESS);
ProcessProtocol->DestroyThread(ProcessProtocol, ThreadEnv);
return EFI_SUCCESS;
}
VOID EFIAPI ThreadProcess(IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable)
{
// 在这里实现多线程的具体逻辑,例如打印字符串
Print(L"Hello, Multithreading!\n");
// 结束线程
EFI_PROCESS_PROTOCOL *ProcessProtocol;
EFI_STATUS Status = gBS->LocateProtocol(&gEfiProcessProtocolGuid, NULL, (VOID **)&ProcessProtocol);
if (EFI_ERROR(Status))
{
Print(L"Locate Protocol Failed\n");
return;
}
EFI_PROCESS_ID CurrentThreadId;
Status = ProcessProtocol->GetCurrentThread(ProcessProtocol, &CurrentThreadId);
if (EFI_ERROR(Status))
{
Print(L"Get Current Thread Failed\n");
return;
}
ProcessProtocol->Exit(ProcessProtocol, CurrentThreadId, EFI_SUCCESS);
}
```
在这个示例代码中,我们首先使用`gBS->LocateProtocol()`函数获取`EFI_PROCESS_PROTOCOL`协议,然后使用`CreateProcess()`函数创建一个名为`ThreadProcess`的进程。接着,使用`GetCurrentThread()`函数获取当前线程的ID,并使用`CreateThread()`函数创建一个名为`ThreadEnv`的线程环境。使用`CreateEvent()`函数创建一个事件对象,并使用`StartThread()`函数启动线程,在线程中执行具体的逻辑。最后,使用`Terminate()`函数和`DestroyThread()`函数清理资源。