Downgrades a complex lock from exclusive-write mode to shared-read mode.
#include <sys/lock_def.h>
void lock_write_to_read (lock_addr) complex_lock_t lock_addr;
| lock_addr | Specifies the address of the lock word to be downgraded from exclusive-write to shared-read mode. |
The lock_write_to_read kernel service downgrades the specified complex lock from exclusive-write mode to shared-read mode. The calling kernel thread must hold the lock in exclusive-write mode.
Once the lock has been downgraded to shared-read mode, other kernel threads will also be able to acquire it in shared-read mode.
The lock_write_to_read kernel service can be called from the process environment only.
The lock_write_to_read kernel service has no return values.
The lock_write_to_read kernel service is part of the Base Operating System (BOS) Runtime.
The lock_init kernel service, lock_islocked kernel service, lock_done kernel service, lock_read_to_write kernel service, lock_try_read_to_write kernel service, lock_try_write kernel service, lock_write kernel service.
Understanding Locking and Locking Kernel Services in AIX Kernel Extensions and Device Support Programming Concepts