plan9port

commit e68f07d46f5f168dc2076286627279540bf1f99e
parent b73633b1b4e9d3dbd680edf900b2b53befbf5a9a
Author: Russ Cox <rsc@swtch.com>
Date:   Wed, 30 Dec 2020 00:16:10 -0500

libthread: make pthreadperthread the default

Diffstat:
M
man/man3/thread.3
 | 
34
++++++++++++++--------------------
M
src/libthread/thread.c
 | 
2
+-

2 files changed, 15 insertions(+), 21 deletions(-)
diff --git a/man/man3/thread.3 b/man/man3/thread.3
@@ -158,27 +158,21 @@ by
 The thread library provides a
 .I main
 function that sets up a proc with a single thread executing
-.I threadmain
-on a stack of size
-.I mainstacksize
-(default eight kilobytes).
-To set
-.IR mainstacksize ,
-declare a global variable
-initialized to the desired value
-.RI ( e.g. ,
-.B int
-.B mainstacksize
-.B =
-.BR 1024 ).
-When using the
+.IR threadmain .
+.PP
+Every thread is backed by an operating system-provided
 .I pthread
-library,
-.B mainstacksize
-is ignored, as is the stack size argument to
-.BR proccreate :
-the first thread in each proc
-runs on the native system stack.
+and runs on its system-provided stack;
+.I mainstacksize
+and the the stack size arguments to
+.I proccreate
+and
+.I threadcreate
+are ignored.
+Although each thread is backed by a separate
+.IR pthread ,
+the threads in a proc are still scheduled non-preemptively
+as on Plan 9 and as described below.
 .PP
 .I Threadcreate
 creates a new thread in the calling proc, returning a unique integer
diff --git a/src/libthread/thread.c b/src/libthread/thread.c
@@ -7,7 +7,7 @@ static	uint		threadnsysproc;
 static	Lock		threadnproclock;
 static	Ref		threadidref;
 static	Proc		*threadmainproc;
-static	int		pthreadperthread;
+static	int		pthreadperthread = 1;
 
 static	void		addproc(Proc*);
 static	void		delproc(Proc*);