traverseda
/
cpython
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

coalesce GILless sections in new_buffersize (#5059) 

830daae1c8 added some new GIL-releasing to new_buffersize. This is fine, but it's better to avoid reacquiring the GIL for as long as possible. Also, it should use FILE_(BEGIN|END)_ALLOW_THREADS to avoid having the file closed from under it.
This commit is contained in:
Benjamin Peterson 2018-01-02 15:52:42 -08:00 committed by GitHub
parent dbf52e02f1
commit eb08a9290f
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
Objects/fileobject.c
View File

@ -1015,10 +1015,10 @@ new_buffersize(PyFileObject *f, size_t currentsize)
off_t pos, end;
struct stat st;
int res;
size_t bufsize = 0;
Py_BEGIN_ALLOW_THREADS
FILE_BEGIN_ALLOW_THREADS(f)
res = fstat(fileno(f->f_fp), &st);
Py_END_ALLOW_THREADS
if (res == 0) {
end = st.st_size;
@ -1032,9 +1032,7 @@ new_buffersize(PyFileObject *f, size_t currentsize)
need to take the amount of buffered data into account.
(Yet another reason why stdio stinks. :-) */
Py_BEGIN_ALLOW_THREADS
pos = lseek(fileno(f->f_fp), 0L, SEEK_CUR);
Py_END_ALLOW_THREADS
if (pos >= 0) {
pos = ftell(f->f_fp);
@ -1042,9 +1040,12 @@ new_buffersize(PyFileObject *f, size_t currentsize)
if (pos < 0)
clearerr(f->f_fp);
if (end > pos && pos >= 0)
return currentsize + end - pos + 1;
bufsize = currentsize + end - pos + 1;
/* Add 1 so if the file were to grow we'd notice. */
}
FILE_END_ALLOW_THREADS(f)
if (bufsize != 0)
return bufsize;
#endif
/* Expand the buffer by an amount proportional to the current size,
giving us amortized linear-time behavior. Use a less-than-double