diff options
Diffstat (limited to 'man3/pthread_spin_init.3')
| -rw-r--r-- | man3/pthread_spin_init.3 | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/man3/pthread_spin_init.3 b/man3/pthread_spin_init.3 index 87ad2e8..57ccb88 100644 --- a/man3/pthread_spin_init.3 +++ b/man3/pthread_spin_init.3 @@ -2,7 +2,7 @@ .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" -.TH pthread_spin_init 3 2023-03-30 "Linux man-pages 6.05.01" +.TH pthread_spin_init 3 2023-10-31 "Linux man-pages 6.7" .SH NAME pthread_spin_init, pthread_spin_destroy \- initialize or destroy a spin lock .SH LIBRARY @@ -11,16 +11,16 @@ POSIX threads library .SH SYNOPSIS .nf .B #include <pthread.h> -.PP +.P .BI "int pthread_spin_init(pthread_spinlock_t *" lock ", int " pshared ");" .BI "int pthread_spin_destroy(pthread_spinlock_t *" lock ");" .fi -.PP +.P .RS -4 Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .RE -.PP +.P .BR pthread_spin_init (), .BR pthread_spin_destroy (): .nf @@ -33,7 +33,7 @@ instead of spin locks. Spin locks are primarily useful in conjunction with real-time scheduling policies. See NOTES. -.PP +.P The .BR pthread_spin_init () function allocates any resources required for the use of @@ -56,12 +56,12 @@ The spin lock may be operated on by any thread in any process that has access to the memory containing the lock (i.e., the lock may be in a shared memory object that is shared among multiple processes). -.PP +.P Calling .BR pthread_spin_init () on a spin lock that has already been initialized results in undefined behavior. -.PP +.P The .BR pthread_spin_destroy () function destroys a previously initialized spin lock, @@ -69,13 +69,13 @@ freeing any resources that were allocated for that lock. Destroying a spin lock that has not been previously been initialized or destroying a spin lock while another thread holds the lock results in undefined behavior. -.PP +.P Once a spin lock has been destroyed, performing any operation on the lock other than once more initializing it with .BR pthread_spin_init () results in undefined behavior. -.PP +.P The result of performing operations such as .BR pthread_spin_lock (3), .BR pthread_spin_unlock (3), @@ -108,7 +108,7 @@ POSIX.1-2008. .SH HISTORY glibc 2.2. POSIX.1-2001. -.PP +.P Support for process-shared spin locks is a POSIX option. The option is supported in the glibc implementation. .SH NOTES @@ -124,10 +124,10 @@ The problem is that if a thread operating under such a policy is scheduled off the CPU while it holds a spin lock, then other threads will waste time spinning on the lock until the lock holder is once more rescheduled and releases the lock. -.PP +.P If threads create a deadlock situation while employing spin locks, those threads will spin forever consuming CPU time. -.PP +.P User-space spin locks are .I not applicable as a general locking solution. |