Add a way to distinguish between forking and thread creation in schedtail.
For CloudABI we need to initialize the registers of new threads differently based on whether the thread got created through a fork or through simple thread creation. Add a flag, TDP_FORKING, that is set by do_fork() and cleared by fork_exit(). This can be tested against in schedtail. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D3973
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=289748
@ -586,7 +586,7 @@ do_fork(struct thread *td, int flags, struct proc *p2, struct thread *td2,
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* been preserved.
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*/
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p2->p_flag |= p1->p_flag & P_SUGID;
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td2->td_pflags |= td->td_pflags & TDP_ALTSTACK;
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td2->td_pflags |= (td->td_pflags & TDP_ALTSTACK) | TDP_FORKING;
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SESS_LOCK(p1->p_session);
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if (p1->p_session->s_ttyvp != NULL && p1->p_flag & P_CONTROLT)
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p2->p_flag |= P_CONTROLT;
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@ -1023,6 +1023,7 @@ fork_exit(void (*callout)(void *, struct trapframe *), void *arg,
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if (p->p_sysent->sv_schedtail != NULL)
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(p->p_sysent->sv_schedtail)(td);
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td->td_pflags &= ~TDP_FORKING;
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}
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/*
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@ -176,6 +176,9 @@ syscallret(struct thread *td, int error, struct syscall_args *sa)
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struct proc *p, *p2;
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int traced;
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KASSERT((td->td_pflags & TDP_FORKING) == 0,
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("fork() did not clear TDP_FORKING upon completion"));
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p = td->td_proc;
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/*
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@ -446,7 +446,7 @@ do { \
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#define TDP_RESETSPUR 0x04000000 /* Reset spurious page fault history. */
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#define TDP_NERRNO 0x08000000 /* Last errno is already in td_errno */
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#define TDP_UIOHELD 0x10000000 /* Current uio has pages held in td_ma */
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#define TDP_UNUSED29 0x20000000 /* --available-- */
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#define TDP_FORKING 0x20000000 /* Thread is being created through fork() */
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#define TDP_EXECVMSPC 0x40000000 /* Execve destroyed old vmspace */
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/*
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