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- Add in PROC_LOCK() and PROC_UNLOCK() macros. For now these do simple

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mutex operations.  In the future they may call functions that verify
  correct locking order between processes in the INVARIANTS case.
- Lock the process in PHOLD() and PREL().
This commit is contained in:
John Baldwin 2000-12-06 02:01:56 +00:00
parent f3b0f821b0
commit 495c2d2085
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=69654
1 changed files with 14 additions and 2 deletions
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16
sys/sys/proc.h
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@ -383,12 +383,24 @@ sigonstack(size_t sp)
} \
} while (0)
/* Lock and unlock a process. */
#define PROC_LOCK(p) mtx_enter(&(p)->p_mtx, MTX_DEF)
#define PROC_UNLOCK(p) mtx_exit(&(p)->p_mtx, MTX_DEF)
/* Hold process U-area in memory, normally for ptrace/procfs work. */
#define PHOLD(p) do { \
if ((p)->p_lock++ == 0 && ((p)->p_flag & P_INMEM) == 0) \
PROC_LOCK(p); \
if ((p)->p_lock++ == 0 && ((p)->p_flag & P_INMEM) == 0) { \
PROC_UNLOCK(p); \
faultin(p); \
} else \
PROC_UNLOCK(p); \
} while(0)
#define PRELE(p) do { \
PROC_LOCK(p); \
(--(p)->p_lock); \
PROC_UNLOCK(p); \
} while(0)
#define PRELE(p) (--(p)->p_lock)
#define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash])
extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;