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libthread: add threadmaybackground

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Programs that want to background themselves now need
to define threadmaybackground returning 1.
This avoids a confusing (to people and debuggers)
extra parent process for all the threaded programs
that will never want to background themselves.
This commit is contained in:
Russ Cox 2020-12-30 00:10:11 -05:00
parent 5b37d91264
commit b3a20a96eb
19 changed files with 120 additions and 21 deletions
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7
include/thread.h
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@ -1,7 +1,7 @@
#ifndef _THREAD_H_
#define _THREAD_H_ 1
#if defined(__cplusplus)
extern "C" {
extern "C" {
#endif
AUTOLIB(thread)
@ -15,6 +15,7 @@ void threadexits(char *);
void threadexitsall(char *);
void threadsetname(char*, ...);
void threadsetstate(char*, ...);
void threadneedbackground(void);
char *threadgetname(void);
int threadyield(void);
int threadidle(void);
@ -60,6 +61,8 @@ void **threaddata(void);
void threadmain(int argc, char *argv[]);
extern int mainstacksize;
int threadmaybackground(void);
/*
* channel communication
*/
@ -180,7 +183,7 @@ int threadspawnl(int[3], char*, ...);
Channel* threadwaitchan(void);
/*
* alternate interface to threadwaitchan - don't use both!
* alternate interface to threadwaitchan - don't use both!
*/
Waitmsg* procwait(int pid);