CURPROC(9)

NAME
curproc, curcpu, curlwp - current process, processor, and LWP

SYNOPSIS
#include <sys/proc.h>
struct cpu_info *
curcpu(void);
struct proc *curproc;
struct lwp *curlwp;

DESCRIPTION
The following macros retrieve the current CPU, process, and thread (lightweight process, or LWP), respectively:

curcpu()
    Returns a pointer to the struct cpu_info structure representing the CPU that the code calling it is running on.

    The value of curcpu() is unstable and may be stale as soon as it is read unless the caller prevents preemption by raising the IPL (spl(9), mutex(9)), by disabling preemption (kpreempt_disable(9)), or by binding the thread to its CPU (curlwp_bind(9)).

curproc
    Yields a pointer to the struct proc structure representing the currently running process.

    The value of curproc is stable and does not change during execution except in machine-dependent logic to perform context switches, so it works like a global constant, not like a stateful procedure.

curlwp
    Yields a pointer to the struct lwp structure representing the currently running thread.

    The value of curlwp is stable and does not change during execution except in machine-dependent logic to perform context switches, so it works like a global constant, not like a stateful procedure.

SOURCE REFERENCES
The curcpu() macro is defined in the machine-independent machine/cpu.h.

The curproc macro is defined in sys/lwp.h.

The curlwp macro has a machine-independent definition in sys/lwp.h, but it may be overridden by machine/cpu.h, and must be overridden on architectures supporting multiprocessing and kernel preemption.

SEE ALSO
cpu_number(9), proc_find(9)