Skip to content

线程（Thread）

创建线程

int mythread(SceSize args , void ∗argp)
{ 
    /∗ Do something ∗/ 
}

SceUID thid ;
/∗ Create a user thread ∗/
thid = sceKernelCreateThread(”MyThread” , // Name
    mythread,// Entry Point
    20, // Priority
    16384, // Stack Size
    0, // Attribute
    NULL);

/∗ Start thread with arguments ∗/
sceKernelStartThread (thid , args , argp)

  • SceUID sceKernelCreateThread(const char * name, SceKernelThreadEntry entry,int initPriority, int stackSize, SceUInt attr,SceKernelThreadOptParam *option)

线程参数

PSP_THREAD_ATTR_VFPU Enable VFPU access for the thread.

PSP_THREAD_ATTR_USER Start the thread in user mode (done automatically if the thread creating it is in user mode).

PSP_THREAD_ATTR_USBWLAN Thread is part of the USB/WLAN API.

PSP_THREAD_ATTR_VSH Thread is part of the VSH API.

PSP_THREAD_ATTR_SCRATCH_SRAM Allow using scratchpad memory for a thread, NOT USABLE ON V1.0.

PSP_THREAD_ATTR_NO_FILLSTACK Disables filling the stack with 0xFF on creation.

PSP_THREAD_ATTR_CLEAR_STACK Clear the stack when the thread is deleted.

线程安全性

  • Threads have a privilege level which indicates if they can run in kernel or user mode. This allows protection of kernel memory from user applications.
  • When creating a new thread, you cannot escalate its privilege level.
  • Thread primitives inherit permissions of the thread which created them.
  • You cannot enumerate or use thread primitives without the same privilege.
  • During syscall transition, a separately allocated stack is used to prevent attacks or data leakage.
  • All kernel functions which take pointer arguments check them based on the thread's privilege.