From c42be504c92d76d2e06d0fc8ebd05fc913376d2d Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Wed, 16 Nov 2016 14:50:09 +0100 Subject: posix: Add self-contained pthread spinlock Turn pthread_spinlock_t into a self-contained object. On uni-processor configurations, interrupts are disabled in the lock/trylock operations and the previous interrupt status is restored in the corresponding unlock operations. On SMP configurations, a ticket lock is a acquired and released in addition. The self-contained pthread_spinlock_t object is defined by Newlib in . typedef struct { struct _Ticket_lock_Control _lock; __uint32_t _interrupt_state; } pthread_spinlock_t; This implementation is simple and efficient. However, this test case of the Linux Test Project would fail due to call of printf() and sleep() during spin lock ownership: https://github.com/linux-test-project/ltp/blob/master/testcases/open_posix_testsuite/conformance/interfaces/pthread_spin_lock/1-2.c There is only limited support for profiling on SMP configurations. Delete CORE spinlock implementation. Update #2674. --- cpukit/configure.ac | 1 + 1 file changed, 1 insertion(+) (limited to 'cpukit/configure.ac') diff --git a/cpukit/configure.ac b/cpukit/configure.ac index 136630bd7e..5a6c2e66bf 100644 --- a/cpukit/configure.ac +++ b/cpukit/configure.ac @@ -74,6 +74,7 @@ AC_CHECK_HEADERS([envlock.h]) AC_CHECK_DECLS([__env_lock],,,[#include ]) AC_CHECK_DECLS([__env_unlock],,,[#include ]) AC_CHECK_TYPES([struct _Thread_queue_Queue],[],[],[#include ]) +AC_CHECK_SIZEOF([pthread_spinlock_t],[],[],[#include ]) # Mandated by POSIX, older newlibs bogusly provided CLOCK_PROCESS_CPUTIME+CLOCK_THREAD_CPUTIME AC_CHECK_DECL([CLOCK_PROCESS_CPUTIME_ID],[],[AC_MSG_ERROR([missing define CLOCK_PROCESS_CPUTIME_ID])],[#include ]) -- cgit v1.2.3