Don't return until this process has a job token. Args: reason: the reason (for debugging purposes) we need a token. Usually the name of a target we want to build. max_delay: the max time to wait for a token, or None if forever. Returns: None, but has_token() is no
(reason, max_delay=None)
| 346 | |
| 347 | |
| 348 | def _ensure_token(reason, max_delay=None): |
| 349 | """Don't return until this process has a job token. |
| 350 | |
| 351 | Args: |
| 352 | reason: the reason (for debugging purposes) we need a token. Usually |
| 353 | the name of a target we want to build. |
| 354 | max_delay: the max time to wait for a token, or None if forever. |
| 355 | Returns: |
| 356 | None, but has_token() is now true *unless* max_delay is non-None |
| 357 | and we timed out. |
| 358 | """ |
| 359 | global _mytokens |
| 360 | assert state.is_flushed() |
| 361 | assert _mytokens <= 1 |
| 362 | while 1: |
| 363 | if _mytokens >= 1: |
| 364 | _debug("_mytokens is %d\n" % _mytokens) |
| 365 | assert _mytokens == 1 |
| 366 | _debug('(%r) used my own token...\n' % reason) |
| 367 | break |
| 368 | assert _mytokens < 1 |
| 369 | _debug('(%r) waiting for tokens...\n' % reason) |
| 370 | _wait(want_token=1, max_delay=max_delay) |
| 371 | if _mytokens >= 1: |
| 372 | break |
| 373 | assert _mytokens < 1 |
| 374 | b = _try_read(_tokenfds[0], 1) |
| 375 | if b == '': |
| 376 | raise Exception('unexpected EOF on token read') |
| 377 | if b: |
| 378 | _mytokens += 1 |
| 379 | _debug('(%r) got a token (%r).\n' % (reason, b)) |
| 380 | break |
| 381 | if max_delay != None: |
| 382 | break |
| 383 | assert _mytokens <= 1 |
| 384 | |
| 385 | |
| 386 | def ensure_token_or_cheat(reason, cheatfunc): |
no test coverage detected