"No manual entry for pthread" - could not find man page by name

Question

I am new to Ubuntu, wanted to code for reader-writer block in Operating System, but when I fired the command man pthread it gave me an error no manual entry for pthread. What can be done to resolve the problem?

Answer 1

First install these manpages:

sudo apt-get install manpages-posix manpages-posix-dev

and then:

man pthreads

Now it should work.

Answer 2

Ok, so the man page you look for is not there:

$ man pthread
No manual entry for pthread

Hmm... let's look for something similar!
We will se man option -k for that:

$ man -k pthread 
pthread_attr_destroy (3) - initialize and destroy thread attributes object
pthread_attr_getaffinity_np (3) - set/get CPU affinity attribute in thread attributes object
pthread_attr_getdetachstate (3) - set/get detach state attribute in thread attributes object
pthread_attr_getguardsize (3) - set/get guard size attribute in thread attributes object
[... 47 more lines ...]
pthread_timedjoin_np (3) - try to join with a terminated thread
pthread_tryjoin_np (3) - try to join with a terminated thread
pthread_yield (3)    - yield the processor
pthreads (7)         - POSIX threads
vfs_aio_pthread (8)  - implement async I/O in Samba vfs using a pthread pool

Ok... some related stuff... Oh! pthreads looks interesting!

$ man pthreads|head -n 12
PTHREADS(7)           Linux Programmer's Manual          PTHREADS(7)



NAME
       pthreads - POSIX threads

DESCRIPTION
       POSIX.1  specifies  a  set  of  interfaces (functions, header
       files) for  threaded  programming  commonly  known  as  POSIX
       threads,  or Pthreads.  A single process can contain multiple
       threads, all of which are executing the same program.   These

Now, looks like we found it!

Answer 3

Even if we have installed related man packages, we may still suffer "No manual entry for pthread".

On ubuntu, we should use

man pthreads (note the bold s)

instead of

man pthread