test-process-priority.c

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#include "uv.h"
#include "task.h"
 
 
TEST_IMPL(process_priority) {
  int priority;
  int r;
  int i;
 
#if defined(__MVS__)
  if (uv_os_setpriority(0, 0) == UV_ENOSYS)
    RETURN_SKIP("functionality not supported on zOS");
#endif
 
  /* Verify that passing a NULL pointer returns UV_EINVAL. */
  r = uv_os_getpriority(0, NULL);
  ASSERT(r == UV_EINVAL);
 
  /* Verify that all valid values work. */
  for (i = UV_PRIORITY_HIGHEST; i <= UV_PRIORITY_LOW; i++) {
    r = uv_os_setpriority(0, i);
 
    /* If UV_EACCES is returned, the current user doesn't have permission to
       set this specific priority. */
    if (r == UV_EACCES)
      continue;
 
    ASSERT(r == 0);
    ASSERT(uv_os_getpriority(0, &priority) == 0);
 
    /* Verify that the priority values match on Unix, and are range mapped
       on Windows. */
#ifndef _WIN32
    ASSERT(priority == i);
#else
    /* On Windows, only elevated users can set UV_PRIORITY_HIGHEST. Other
       users will silently be set to UV_PRIORITY_HIGH. */
    if (i < UV_PRIORITY_HIGH)
      ASSERT(priority == UV_PRIORITY_HIGHEST || priority == UV_PRIORITY_HIGH);
    else if (i < UV_PRIORITY_ABOVE_NORMAL)
      ASSERT(priority == UV_PRIORITY_HIGH);
    else if (i < UV_PRIORITY_NORMAL)
      ASSERT(priority == UV_PRIORITY_ABOVE_NORMAL);
    else if (i < UV_PRIORITY_BELOW_NORMAL)
      ASSERT(priority == UV_PRIORITY_NORMAL);
    else if (i < UV_PRIORITY_LOW)
      ASSERT(priority == UV_PRIORITY_BELOW_NORMAL);
    else
      ASSERT(priority == UV_PRIORITY_LOW);
#endif
 
    /* Verify that the current PID and 0 are equivalent. */
    ASSERT(uv_os_getpriority(uv_os_getpid(), &r) == 0);
    ASSERT(priority == r);
  }
 
  /* Verify that invalid priorities return UV_EINVAL. */
  ASSERT(uv_os_setpriority(0, UV_PRIORITY_HIGHEST - 1) == UV_EINVAL);
  ASSERT(uv_os_setpriority(0, UV_PRIORITY_LOW + 1) == UV_EINVAL);
 
  return 0;
}