pthread_cond_signal(3)

pthread_cond_signal3

Unblock a thread waiting for a condition variable

Usage

#include <pthread.h>

int

pthread_cond_signal(pthread_cond_t *cond);

Library

POSIX Threads Library (libpthread, -lpthread)

Overview

The pthread_cond_signal() function unblocks one thread waiting for the condition variable cond.

Return values

If successful, the pthread_cond_signal() function will return zero, otherwise an error number will be returned to indicate the error.

Errors

The pthread_cond_signal() function will fail if:

[EINVAL]

The value specified by cond is invalid.

Releases

79 releases since FreeBSD 2.2.8-RELEASE; the text changed 42 times.

  1. 2.2.8–3.2
  2. 3.3–3.4
  3. 3.5–3.5.1
  4. 4.0
  5. 4.1–4.2
  6. 4.3
  7. 4.4
  8. 4.5–4.11
  9. 5.0
  10. 5.1–5.2.1
  11. 5.3–6.3
  12. 6.4
  13. 7.0
  14. 7.1
  15. 7.2
  16. 7.3
  17. 7.4
  18. 8.0
  19. 8.1
  20. 8.2
  21. 8.3
  22. 8.4
  23. 9.0
  24. 9.1
  25. 9.2
  26. 9.3
  27. 10.0
  28. 10.1
  29. 10.2
  30. 10.3
  31. 10.4
  32. 11.0
  33. 11.1
  34. 11.2
  35. 11.3
  36. 11.4
  37. 12.0
  38. 12.1
  39. 12.2
  40. 12.3
  41. 12.4
  42. 13.0–13.2
  43. 13.3–16.0

Standards

The pthread_cond_signal() function conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).

From base 16.0-CURRENT-20261027-61c70dc16a79 in FreeBSD 16.0-CURRENT (2026-10-27). Parsed by carta from the page's mdoc source.